All Questions

255

Algebra

At a certain time of day, a tree that is x meters tall casts a shadow that is x−21 meters long. If the distance from the top of the tree to the end of the shadow is x+3 meters, what is the height, x, of the tree?

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Guest Aug 11, 2021

320

+16

Geometry Help

A certain square and a certain equilateral triangle have the same perimeter. The square and triangle are inscribed in circles, as shown below. If $A$ is the area of the circle containing the square, and $B$ is the area of the circle containing the triangle, read more ..

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okhurana Aug 11, 2021

180

help algebra

What is the sum of the first twenty terms that are in both series 3 + 7 + 11 + 15 + ... and 1 + 6 + 11 + 16 + ...

Guest Aug 11, 2021

233

please help

Given that $a$ and $b$ are real numbers such that $-3\leq a\leq1$ and $-2\leq b\leq 4$, and values for $a$ and $b$ are chosen at random, what is the probability that the product $a\cdot b$ is positive? Express your answer as a common fraction. read more ..

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Guest Aug 11, 2021

355

Rationalize

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Guest Aug 11, 2021

405

i am sorry the formatting went crazy last time

In the SuperLottery, three balls are drawn (at random) from ten white balls numbered from $1$ to $10$, and one SuperBall is drawn (at random) from ten red balls numbered from $11$ to $20$. When you buy a ticket, you choose three numbers from $1$ to $10,$ read more ..

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Guest Aug 11, 2021

321

Circles

If an arc of 60° on circle  has the same length as an arc of 45° on circle , what is the ratio of the area of circle  to the area of circle ?

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Guest Aug 11, 2021

210

Geometry

How many non-congruent triangles are there with sides of integer length having at least one side of length five units and having no side longer than five units?

Guest Aug 11, 2021

186

Polynomial

Find all roots given that x = 3 + i is a solution.
x^4 - 10x^3 + 29x^2 - 10x - 50 = 0

Guest Aug 11, 2021

340

+68

First Day - Web2.0Calc Forum

Hi Y'all,

Today was my first day answering questions on Forum.
read more ..

Bulbous Aug 11, 2021

492

For some positive integer n, the expansion of (1-x)^n has three consecutive coefficients a, b, and c that satisfy 1:7:35 What must n be?

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Guest Aug 11, 2021

210

Algebra

If z is a complex number satisfying z + 1/z = 1, calculate z^10 + 1/(z^10).

Guest Aug 11, 2021

330

Geometry

Your friend's house is 5 miles south and 12 miles west of the zoo. How far is your friend's house from the zoo?

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Guest Aug 11, 2021

325

help plz

Chris labels every lattice point in the coordinate plane with the square of the distance from the point to the origin (a lattice point is a point such that both of its coordinates are integers). How many times does he label a point with the number 65? read more ..

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Guest Aug 11, 2021

189

math

Find the equation for an ellipse with the center at the origin, focus (-12,0) and an endpoint of the minor axis at (0,5).

Guest Aug 11, 2021

333

Math

Andy, Boris and Charles had a total of 2475 stamps. At first, Andy gave 1/2 of his stamps to Boris. Boris then gave 2/3 of his stamps to Charles. Finally, Charles gave 1/6 of him stamps to Andy. In the end, the ratio of the number of Andy's stamps to the read more ..

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Guest Aug 11, 2021

328

trig

If sin A = 3/5 and sin B = 5/13, and angles A and B are acute angles, what is the value of cos(A - B)?

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Guest Aug 11, 2021

363

Probability

Two different integers are randomly chosen from the set \{ -5, -8, 7, 4, -2, 3, 1 \}. What is the probability that their product is negative? Express your answer as a common fraction.

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Guest Aug 11, 2021

392

Given that $a$ and $b$ are real numbers such that $-3\leq a\leq1$ and $-2\leq b\leq 4$, and values for $a$ and $b$ are chosen at random, wha

Given that and are real numbers such that and , and values for and are chosen at random, what is the probability that the product is positive? Express your answer as a common fraction. read more ..

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Guest Aug 11, 2021

389

help pls

DeShawn's school is selling tickets to the annual dance competition. On the first day of ticket sales, the school sold 1 adult ticket and 2 student tickets for a total of 18 dollars. The school took in 43 dollars on the second day by selling 1 adult ticket read more ..

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Guest Aug 11, 2021

Aug 10, 2021

408

+68

Please help me in advanced

Alvin spent $28 more than 2/5 of his money on books. He was left with $44. How much did Alvin have at first?

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Svtturtles Aug 10, 2021

253

Number Theory

How many natural-number factors does N have if $N = 2^4 \cdot 3^3 \cdot 5^2 \cdot 7^4 \cdot 11^2$?

Guest Aug 10, 2021

511

+80

help please

Question:

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jleung Aug 10, 2021

330

In the SuperLottery, three balls are drawn (at random) from ten white balls numbered from $1$ to $10$, and one SuperBall is drawn (at random

In the SuperLottery, three balls are drawn (at random) from ten white balls numbered from to , and one SuperBall is drawn (at random) from ten red balls numbered from to . When you buy a ticket, you choose three read more ..

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Guest Aug 10, 2021

305

Coordinates

Given two lines whose equations are 3x + y - 8 = 0 and -2x + by + 9 = 0, determine the value of b such that the two lines will be perpendicular.

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Guest Aug 10, 2021

All Questions ⁺⁰231295 Questions

Algebra

Geometry Help

help algebra

please help

Rationalize

i am sorry the formatting went crazy last time

Circles

Geometry

Polynomial

First Day - Web2.0Calc Forum

For some positive integer n, the expansion of (1-x)^n has three consecutive coefficients a, b, and c that satisfy 1:7:35 What must n be?

Algebra

Geometry

help plz

math

Math

trig

Probability

Given that $a$ and $b$ are real numbers such that $-3\leq a\leq1$ and $-2\leq b\leq 4$, and values for $a$ and $b$ are chosen at random, wha

help pls

Please help me in advanced

Number Theory

help please

In the SuperLottery, three balls are drawn (at random) from ten white balls numbered from $1$ to $10$, and one SuperBall is drawn (at random

Coordinates

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