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All Questions
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229704 Questions
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370
1
expected value
1. Suppose we have a bag with 10 slips of paper in it. Eight slips have a 3 on them and the other two have a 8 on them. What is the expected value of the number shown when we draw a single slip of paper?
2. Suppose we have a
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Guest
Feb 14, 2021
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262
1
circle problem
Circle Gamma is the incircle ABC of and is also the circumcircle of XYZ. The point X is on BC, point Y is on AB, and the point is Z on AC. If angle A = 40, angle B = 80, and angle C = 60, what is the measure of angle AYX?
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Guest
Feb 14, 2021
0
421
2
lcm
find the LCM of (x-3)^2, x^(2)-9, and (x + 3)^2 and (x - 1)^2.
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Guest
Feb 14, 2021
0
228
0
please help asap! confusing geometry problem.
In this drawing, point D is constucted by drawing an arc with Center C and radius AB and an arc with center B and radius AC. Prove that AM is a median of ABC.
Guest
Feb 14, 2021
+1
364
1
kinda confusing
the function f(x) satisfies f(sqrt x+1)=1/x for all x greater than or equal to -1, while x cannot be zero. Find f(2)
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Guest
Feb 14, 2021
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373
1
word problem
A salesperson bought a case of pens. On Monday, he sold ½ of the pens. On Tuesday, he sold 30 more. On Wednesday, he sold 1/3 of the pens that were left. On Thursday, he sold the remaining 40 pens. How many pens were originally in the case?
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Guest
Feb 14, 2021
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310
1
help please
Let f(x)=2x^2+3x-9, g(x)=5x+11, h(x)=3x^2+1. Find f(x)-g(x)+h(x)
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Guest
Feb 14, 2021
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502
7
+88
Question on polynomial division question
I was looking at this question: https://web2.0calc.com/questions/help-on-hard-division-problem and I'm having difficulty understanding part b. Could somone explain why in order for g(x) to be divisible by f(x), f(x) must have the same
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grs75
Feb 14, 2021
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318
1
math
= (9 x 10⁹ Nm²/C²) (3C) (6C)/10 N
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Guest
Feb 14, 2021
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694
1
algebra
How many gallons of a 25% acid solution should be added with 10 gallons of a 12% acid solution to obtain a 20% acid solution
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Guest
Feb 14, 2021
0
435
1
coefficient
Find the coefficient of y^4 in the expansion of (2y-7)^5.
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Guest
Feb 14, 2021
0
1
758
1
circle
If the length of the shorter arc AB is 22 cm and C is the centre of the circle then the circumference of the circle is?
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Guest
Feb 14, 2021
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411
2
counting problem
Carla has 10 coins, each of which is a nickel, a dime, or a quarter, or a penny. The total value of her coins is less than $1.00. How many different combinations of coins might Carla have?
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Guest
Feb 14, 2021
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436
2
Percents
the girls' team lifted 140% more than the boys' team. The boys team lifted 1400 pounds. How much did the girls team lift?
I know the answer was posted previously as 3360 pounds and the Saxon Algebra answer key says the same thing.
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Guest
Feb 14, 2021
+1
423
1
+193
For complex numbers $z$, let
For complex numbers $z$, let
\[f(z) = \left\{
\begin{array}{cl}
z^{2}&\text{ if }z\text{ is not real}, \\
z+2 &\text{ if }z\text{ is real}.
\end{array} <#> \right.\]
Find $f(i)+f(1)+f(-1)+f(-i)$.
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clairepow
Feb 14, 2021
0
690
1
Help!
A baker bakes a batch of muffins and splits the batch evenly between six different trays. She then adds five croissants to each tray. If each tray now contains at least twenty baked goods, what is the least possible number of muffins in the baker’s original
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Guest
Feb 14, 2021
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370
1
geometry question
In the above figure, $AB = 12$, $FE = 8$, $BC = CD = DE = 3$, $AB\perp BE$, $FE\perp BE$,
Then find the area of $\Delta GCD$.
<
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Guest
Feb 14, 2021
0
1
845
1
help with counting problem
Three lions and three tigers are walking in a row to get ice cream. The lions are fighting so they are not walking next to each other. in how many different ways can the three lions and three tigers walk if no two lions are the same and no two tigers are
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Guest
Feb 14, 2021
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391
2
geometric altitudes
What is the area of a triangle with altitudes of length 3, 4, and 5?
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Guest
Feb 14, 2021
+1
331
1
+193
Functional Operations
The operation $*$ is defined for non-zero $a$ and $b$ as follows: $a * b = \frac{1}{a} + \frac{1}{b}$. If $a+b = 13$ and $ a \times b = 25$, what is the value of $a*b$? Express your answer
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Logarhythm
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clairepow
Feb 14, 2021
0
401
1
i don't get this
Engineer Marvin calculated that a certain construction project can be finished in 200 days by 30 workers. The project started with 30 workers. At the end of 90 days, 10 workers were fired. The remaining workers continued the work for 30 days. Then 30 workers
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Guest
Feb 14, 2021
+5
481
2
+98
Welcome To Calculus
Evaluate the expression $$\int^3_{-2}x^2-2x+3 dx$$
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CitrusCornflakes
Feb 14, 2021
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378
1
percent question
A math student has solved 500 problems and got 350 of them right.
If he now starts getting every problem right, after how many problems will he have got 75% of all his problems right?
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Guest
Feb 14, 2021
0
456
2
help please
Find the total surface area of the following prism.
Logarhythm
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Guest
Feb 14, 2021
0
597
6
rectangle
The length of a rectangle is increased to 2 times its original size and its width is increased to 3 times its original size. If the area of the new rectangle is equal to 1800 square meters, what is the area of the original rectangle?
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Guest
Feb 14, 2021
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