All Questions

Nov 13, 2025

Nov 11, 2025

I'm new to web2.0calc.com (please answer)

web2.0calc features related questions:
1. What is the membership of a user and how do you pay it? (I don't want to pay, but just curious)
2. How is the score of a user calculated?
3. Is the "Top Users" column sorted by read more ..

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ilovewolfoo Nov 11, 2025

Nov 10, 2025

Nov 7, 2025

PSMT Lines

Explore the relationship between speed and the other factors and plot a line for each. Only use linear, exponential and quadratics. Use the below assumptions Assumptions: Car, Car conditions, driver, driver conditions, road, road conditions, weather read more ..

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MagicMan Nov 7, 2025

Nov 6, 2025

Nov 3, 2025

Oct 29, 2025

Oct 26, 2025

Oct 24, 2025

+109

Math

Distinct prime numbers p, q, and r satisfy the equation p(q + r) = 16. Which of the following prime numbers must either q or r be equal to?
2 3 5 7 11

ElectricPavlov ●●

BlackoutMiIkshake Oct 24, 2025

+109

Math

The triangle with vertices at (1,0), (0,1), and (k,k) has area 1/2. Find k.

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BlackoutMiIkshake Oct 24, 2025

+109

Math

Mrs. Monstrous Millie wants to throw a party for a group of monsters and aliens. The monsters each have 5 heads with 7 ears on each head, and the aliens each have 5 heads with 3 ears on each head. As party favors, Mrs. Millie wants to give each guest a read more ..

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BlackoutMiIkshake Oct 24, 2025

Oct 23, 2025

Oct 22, 2025

+109

Math

Siva starts at vertex A of square ABCD with side length 10. He walks towards vertex C, along the diagonal AC. He then walks towards B, then towards D. What is the length of his path?

Bosco ●

BlackoutMiIkshake Oct 22, 2025

+109

Math

William writes the integers from 2 through 15 from left to right on a piece of paper, then does the following:

* He begins by circling the leftmost uncircled integer, then circles all its powers. Afterwards, he repeats this process until every read more ..

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BlackoutMiIkshake Oct 22, 2025

+109

Math

Two chords with length r are drawn on a circle of radius r. What is the maximum possible distance between their endpoints?

asinus ●

BlackoutMiIkshake Oct 22, 2025

Oct 21, 2025

+109

Math

In the diagram below, AB = AC = 1, and arc BC is centered at A with \angle BAC = 60^\circ. Point D is on \overline{AB}, and point E is on arc BC so that BD = DE, and arc BE (centered at D) is tangent to \overline{AC}. Point F is on \overline{DB}, read more ..

asinus ●

BlackoutMiIkshake Oct 21, 2025

-1

+109

Math

Let ABC be a triangle with \angle B = 90^{\circ}. Suppose that point D lies on segment BC such that angle BAD = \angle CAD, and suppose that point E lies on segment AC such that angle EDA = 60^{\circ}. Given that AD = AC and that CE = 17, find BD.
<read more ..

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BlackoutMiIkshake Oct 21, 2025

Oct 20, 2025

+109

Math

A number is chosen at random from among all 9-digit numbers that use each of the digits 1 through 9 exactly once. What is the probability that this number is a multiple of 2?

Bosco ●●

BlackoutMiIkshake Oct 20, 2025

+109

Math

Three squares of a 5 \times 5 grid are colored. Two colorings are conisdered equivalent if one coloring can be rotated to form the other coloring, such as the two colorings below, and the grid can be reflected as well. We also want the three read more ..

BlackoutMiIkshake Oct 20, 2025

+109

Math

Selma multiplies the number 9 the two-digit number \overline{AB}, and the three-digit number \overline{CDE}. She finds that the product of all three numbers is the five-digit number 41409. Compute the sum \overline{AB} + \overline{CDE}. read more ..

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BlackoutMiIkshake Oct 20, 2025

+109

Math

Given a positive integer N, a multiplication decomposition of N is a sequence of positive integers (d_1, d_2, \dots, d_k) such that
* d_1 \neq 1,
* d_i divides d_{i + 1} for 1 \le i \le k - 1, and
* d_1 d_2 \dotsm d_k = N.
The last read more ..

BlackoutMiIkshake Oct 20, 2025

+109

Math

A traffic light runs repeatedly through the following cycle: green for 40 seconds, then yellow for 5 seconds, then red for 35 seconds, which repeats indefinitely. Oliver picks a random time and watches the light for 75 seconds. What is the probability read more ..

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BlackoutMiIkshake Oct 20, 2025

+109

Math

Consider a cube with side length 1, together with 14 congruent spheres each of radius r, with 8 of the spheres centered at the 8 vertices of the cube and the remaining $6$ spheres centered at the centers of the $6$ faces of the cube. Suppose $r$ is chosen read more ..

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BlackoutMiIkshake Oct 20, 2025

Oct 18, 2025

+109

Math

What is the units digit of 1^1 + 2^2 + 3^4 + 4^8?

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BlackoutMiIkshake Oct 18, 2025

+109

Math

A square has two of its vertices at (12, 34) and (-98, 56),$ and another vertex at (a, b). What is the sum of all possible values of the area of the square?

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BlackoutMiIkshake Oct 18, 2025

Oct 17, 2025

+109

Math

At Patty the panda's pizza parlor, the possible pizza toppings are pesto, pepperoni, peppers, and pineapple, and the possible desserts are pumpkin pie, powdered-sugar pretzels, and papaya popsicles. If Prajwal the porcupine, Petunia the peacock, and Pete read more ..

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BlackoutMiIkshake Oct 17, 2025

+109

Math

In a rectangular prism, the surface area is 24 and the sum of the lengths of all twelve edges is 24. What is the volume of the prism?

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BlackoutMiIkshake Oct 17, 2025

+109

Math

For how many prime numbers p less than 100 is the sum of p's digits less than or equal to 2?

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BlackoutMiIkshake Oct 17, 2025

+109

Math

In the game Nerdle, a player tries to guess a true equation made up of $8$ symbols, each of which is either $+,$ $-,$ $*,$ $/,$ $=,$ or one of the digits from $0$ to $9.$ A square turns teal if the symbol is correct and in the correct location, magenta read more ..

BlackoutMiIkshake Oct 17, 2025

+109

Math

Define the importance of a point (x, y) on the coordinate plane to be x^2 + y^2. There exist some points with positive, integer $x$- and $y$-coordinates whose importances are 5. Find the area of the convex polygon determined by those points.

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BlackoutMiIkshake Oct 17, 2025

+109

Math

A set of 16 positive integers has mean, median, and unique mode all equal to 5. What is the largest possible value of one of the numbers in the set?

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BlackoutMiIkshake Oct 17, 2025

+109

Math

Haoyu gives Mingze and Yihan two different positive integers, and tells them that the product of their numbers is less than 1000. They are also aware that they have two different positive integers. They have the following conversation:
Mingze: read more ..

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BlackoutMiIkshake Oct 17, 2025

+109

Math

Sunita and Mohammed play a game where they start with a pile of candy and take turns eating a prime number of pieces of candy from the pile. A player who leaves 0 or 1 candies in the pile after their move wins. If Sunita and Mohammed both play perfectly read more ..

BlackoutMiIkshake Oct 17, 2025

+109

Math

The shaded region below has area a+b\pi where a and b are positive integers. What is a+b? (You may assume the boundary of each region is made up of straight lines and circular arcs, and the squares of the grid have side length $1.$) read more ..

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BlackoutMiIkshake Oct 17, 2025

+109

Math

Jason is driving from his home to his office, which is 20 miles away. He normally drives at a constant speed of 60 miles per hour for the whole trip. However today, 15 minutes into his drive, his car breaks down. He calls a taxi, and it arrives 20 minutes read more ..

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BlackoutMiIkshake Oct 17, 2025

Oct 16, 2025

+850

Math

In triangle $ABC$, points $D$ and $F$ are on $\overline{AB},$ and $E$ is on $\overline{AC}$ such that $\overline{DE}\parallel \overline{BC}$ and $\overline{EF}\parallel \overline{CD}$. If $CE =3$ and $DF = 3$, then what is $BD$?

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cooIcooIcooI17 Oct 16, 2025

+850

Math

In triangle $PQR,$ $M$ is the midpoint of $\overline{QR}.$ Find $PM.$
PQ = 5, PR = 8, QR = 11

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cooIcooIcooI17 Oct 16, 2025

Oct 15, 2025

+12

Math

Area of compound figure

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BlackoutMilkshake Oct 15, 2025

+12

Math

area of compound figure

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BlackoutMilkshake Oct 15, 2025

+12

Math

I need help. What's the answer?

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BlackoutMilkshake Oct 15, 2025

Oct 14, 2025

Oct 11, 2025

Math

We define a formula that calculates both and . What formula would you create (or use)?

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CharlieMathematical Oct 11, 2025

Oct 7, 2025

+1808

Math

For a positive integer n, let
a_n = 1 + \sqrt{\frac{1}{n}} - \sqrt{\frac{1}{n + 1}
Compute the product a_1 a_2 a_3 \dotsm a_{99}.

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blackpanther Oct 7, 2025

+1808

Math

Find the number of ways of arranging the numbers 1,2 ,3, 4, 5, 6 in a row so that the product of any two adjacent numbers is at least 5.

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blackpanther Oct 7, 2025

+267

Math

A fair coin is tossed repeatedly until either heads comes up three times in a row or tails comes up four times in a row. What is the probability that the coin will be tossed more than 10 times? Express your answer as a common fraction.

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CInsbstnkng Oct 7, 2025

-1

+267

Math

In triangle ABC, cos A=sqrt(7/10) and cos B=sqrt(3/10) Find cos C

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CInsbstnkng Oct 7, 2025

Oct 6, 2025

AMC 10 I want to make AIME - PLEASE HELP

Some context:
Currently, I am in 9th grade and taking Calculus BC.
I can understand competition math problems and what they are asking for but I don't really have a sense for solving them.
I should have started preparing earlier and read more ..

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OOOOOOOO Oct 6, 2025

Oct 1, 2025

Stuck on a Tricky Series Problem

I’ve been working on this series and I’m not sure if I’m approaching it the right way:
At first glance it looks like it might behave similar to the alternating harmonic series, but the sine term is throwing me off. I’m wondering whether this read more ..

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skylerclooney Oct 1, 2025

Sep 29, 2025

Sep 28, 2025

plz help im cooked

Let M⊂R∞×∞\mathcal{M} \subset \mathbb{R}^{\infty \times \infty}M⊂R∞×∞ be the set of all improperly convergent matrices whose entries are defined by the double integral:
Mij=∫0∞∫0∞sin⁡(ix)cos⁡(jy)x2+y2+ij dx dyM_{ij} = \int_0^{\infty} \int_0^{\infty} read more ..

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fof.urmum Sep 28, 2025

Aug 25, 2025

+1285

Math

Alex chooses a number at random from the set {1, 2, 3, 4, 5}. Winnie also chooses a number at random from the same set. (They can choose the same number.) What is the probability that the product of their numbers is at least 4? read more ..

Bosco ●●●

AnswerscorrectIy Aug 25, 2025

+1285

Math

Suppose $f(x)$ is a function defined for all real $x$, and suppose $f$ is invertible (that is, $f^{-1}(x)$ exists for all $x$ in the range of $f$). If the graphs of $y=f(x)$ and $y=f(x^3)$ are drawn, at how many points do they intersect?

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AnswerscorrectIy Aug 25, 2025

Aug 24, 2025

Aug 23, 2025

+943

Math

In triangle $ABC,$ the angle bisector of $\angle BAC$ meets $\overline{BC}$ at $D.$ If $\angle BAC = 60^\circ,$ $\angle CAD = 45^\circ,$ and $AD = 24,$ then find the area of triangle $ABC.$

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booboo44 Aug 23, 2025

+943

Math

In triangle $ABC,$ $\angle B = 90^\circ.$ Point $X$ is on $\overline{AC}$ such that $\angle BXA = 90^\circ,$ $BC = 15,$ and $CX = 5$. What is $BX$?

Bosco ●

booboo44 Aug 23, 2025

+1285

Math

In triangle $ABC,$ let the angle bisectors be $\overline{BY}$ and $\overline{CZ}$. Given $AB = 12$, $AY = 12$, and $AC = 12$, find $BC$.

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AnswerscorrectIy Aug 23, 2025

+67

Geometry Please answer with steps

In rectangle , points and lie on so that and is the midpoint of . Also, intersects at and at . The area of rectangle is 70. Find the area of triangle .
read more ..

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bqimath Aug 23, 2025

+1285

Math

In triangle $ABC,$ let the angle bisectors be $\overline{BY}$ and $\overline{CZ}$. Given $AB = 12$, $AY = 12$, and $AC = 12$, find $BZ$.

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AnswerscorrectIy Aug 23, 2025

Aug 22, 2025

-1

+1285

Math

In quadrilateral $BCED$, sides $\overline{BD}$ and $\overline{CE}$ are extended past $B$ and $C$, respectively, to meet at point $A$. If $BD = 8$, $BC = 3$, $CE = 1$, $AC = 19$ and $AB = 13$, then what is $DE$?

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AnswerscorrectIy Aug 22, 2025

+1285

Math

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AnswerscorrectIy Aug 22, 2025

Aug 21, 2025

+970

Math

Regular hexagon ABCDEF is inscribed in rectangle PQRS. If [AFP] = 20 and [ABC] = 25, then find [ABCDEF].

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gnistory Aug 21, 2025

+970

Math

Point P lies in regular hexagon ABCDEF such that [ABP ] = 3, [CDP] = 3, and [EFP] = 3. Compute [BCP].

gnistory Aug 21, 2025

Aug 20, 2025

+490

Math

Suppose the domain of f is (-1,3). Define the function g by
g(x) = f((x + 1)(x - 2)).
What is the domain of g?

MeIdHunter Aug 20, 2025

+490

Math

There exists a polynomial $f(x)$ and a constant $k$ such that
(x^2 - 2x - 5) f(x) = 2x^4 + 19x^3 + kx^2 - 15x - 1.
What is $k?$

MeIdHunter Aug 20, 2025

Aug 19, 2025

+85

Alcumus

The juniors at East HS drink a total of cartons of milk per -day week. If the average senior drinks milk at the same rate as the average junior, what is the average number of total cartons of milk the seniors drink read more ..

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nerdboy Aug 19, 2025

-1

+267

Help me help

Trapezoid ABCD has bases \overline{AB} and \overline{CD}. The extensions of the two legs of the trapezoid intersect at $P$. If $[PBC] = 15$ and $CD = 3 \cdot AD,$ what is $[ABCD]$?

CInsbstnkng Aug 19, 2025

-1

+267

Need help

Trapezoid ABCD has bases \overline{AB} and \overline{CD}. The extensions of the two legs of the trapezoid intersect at $P$. If $[ABD]=8$ and $[PBC]=8$, then what is $[PAB]$?

CInsbstnkng Aug 19, 2025

+67

Algebra

Let p(x) be defined on such that
where y is the greatest prime factor of . Express the range of p in interval notation.
Thanks and also please show the steps too!

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bqimath Aug 19, 2025

+490

Math

The function f(x) is defined for 1 \le x \le 5 as follows:
f(x) = 2x + 8 if 1 \le x \le 2
f(x) = 13 - 5x if 2 < x \le 3
f(x) = 20 - 14x if 3 < x \le 4 read more ..

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MeIdHunter Aug 19, 2025

+294

how to solve

Given 5 colors to choose from, how many ways can we color the four unit squares of a 2\times 2 board, given that two colorings are considered the same if one is a rotation or reflection of the other? (Note that we can use the same color for more than one read more ..

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AUnVerifedTaxPayer Aug 19, 2025

Aug 18, 2025

-1

+267

help me help me

An equilateral triangle, a regular heptagon, a square, a 20-gon, a regular pentagon, a regular hexagon, and a regular n-gon, all with the same side length also completely surround a point. Find n.

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CInsbstnkng Aug 18, 2025

-1

+267

help me

Let ABCDE be an equilateral pentagon. If the pentagon is concave, and $\angle A = \angle B = 90^{\circ},$ then what is the degree measure of $\angle E$?

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CInsbstnkng Aug 18, 2025

Aug 17, 2025

-1

+267

Help help

Find all ordered pairs x, y of real numbers such that x+y=10 and x^3+y^3=300.
For example, to enter the solutions (2, 4) and (-3, 9), you would enter "(2,4),(-3,9)" (without the quotation marks).

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CInsbstnkng Aug 17, 2025

-1

+267

Help me help

For an integer n, the inequality
x^2 + nx + 15 < -89 - 3x^2
has no real solutions in $x$. Find the number of different possible values of $n$.

CInsbstnkng Aug 17, 2025

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