All Questions +0 136147 Questions

Suppose the function $f(x)$ is defined on the domain $\{x_1,x_2,x_3\}$, so that the graph of $y=f(x)$ consists of just three points. Suppose those three points form a triangle of area $32$. The graph of $y = 2f(2x)$ also consists of just three points. What read more ..

Guest 2 hours ago

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14

0

Help me

Guest 6 hours ago

+1

12

1

+5

help

mooman525 10 hours ago

+1

16

1

How would I simplify this rational expression?

What is the total, between 12 and 72, of rolling a dozen dice that will give the greatest probability of occurrence? Secondly, what is that probability?
Thank you very much for help.

Guest Jul 21, 2018 6:20:16 PM

-1

20

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Dice anyone?

Megan is jealous of her older sister's a by b inch Zac Efron poster, so she cuts out a rectangle around his face, which has dimensions (a/2)-2 by (b/3)-5, and steals it. Megan's older sister decides she's over Zac Efron anyways, and uses the rest read more ..

Guest Jul 21, 2018 4:37:03 PM

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17

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+109

HELP ME

When the expression $-2x^2-20x-53$ is written in the form $a(x+d)^2+e$, where $a$, $d$, and $e$ are constants, then what is the sum $a+d+e$?

xXxTenTacion Jul 21, 2018 4:07:53 PM

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17

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+357

Inverse Functions

John draws a regular five pointed star in the sand, and at each of the 5 outward-pointing points and 5 inward-pointing points he places one of ten different sea shells. How many ways can he place the shells, if reflections and rotations of an arrangement read more ..

Lightning Jul 21, 2018 3:42:10 PM

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17

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Need help for this too

In the local frisbee league, teams have 7 members and each of the 4 teams takes turns hosting tournaments. At each tournament, each team selects two members of that team to be on the tournament committee, except the host team, which selects three members. read more ..

Memes4Life132 Jul 21, 2018 2:35:41 PM

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20

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+28

I need help fast

Let f(x)=3x+4 and g(x)=2x-3. If h(x)=f(g(x)), then what is the inverse of h(x)?

Memes4Life132 Jul 21, 2018 2:34:57 PM

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19

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Inverse Functions

Suppose the function f(x) is defined explicitly by the table This function is defined only for the values of x listed in the table. Suppose g(x) is defined as f(x)-x for all numbers x in the domain of f. How many read more ..

Lightning Jul 21, 2018 1:47:56 PM

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12

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+357

Domain and Range

Define as . If , what is the value of ?

Lightning Jul 21, 2018 1:47:02 PM

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15

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+357

Functional Operations

Let $f(x)=3x+4$ and $g(x)=2x-3$. If $h(x)=f(g(x))$, then what is the inverse of $h(x)$?

Lightning Jul 21, 2018 1:45:36 PM

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13

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+357

help

How many distinct subsets of the set S={1,8,9,39,52,91} have odd sums?
How many distinct subsets of the set S={1,8,9,39,52,91} have three-digit sums?

my casework yeilds incorrect answers of 33 and 52 respectively....hints read more ..

Lightning Jul 21, 2018 1:39:40 PM

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22

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Set theory and counting and probability

1.How many distinct subsets of the set S=1,8,9,39,52,91 have odd sums? (As an example, 1,8,52 is one such subset, because 1+8+52 equals 61, which is odd.)

2.How many distinct subsets of the set S=1,8,9,39,52,91 have three-digit read more ..

Max0815 Jul 21, 2018

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22

5

+43

Help fast!

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lololololololololll Jul 21, 2018

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22

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+28

Last question, running late please help

Dr. Math's four-digit house number ABCD contains no zeroes and can be split into two different two-digit primes ``AB'' and ``CD'' where the digits A, B, C and D are not necessarily distinct. If each of the two-digit primes is less than 40, how many such read more ..

John draws a regular five pointed star in the sand, and at each of the 5 outward-pointing points and 5 inward-pointing points he places one of ten different sea shells. How many ways can he place the shells, if reflections and rotations of an arrangement read more ..

Memes4Life132 Jul 20, 2018

+1

24

6

+28

Need help, thank you for answering

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Memes4Life132 Jul 20, 2018

+1

24

2

+28

Need help. Please reply fast, thank you

In the local frisbee league, teams have 7 members and each of the 4 teams takes turns hosting tournaments. At each tournament, each team selects two members of that team to be on the tournament committee, except the host team, which selects three members. read more ..

Memes4Life132 Jul 20, 2018

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30

2

I neeeddd HALP!

Two jokers are added to a 52 card deck and the entire stack of 54 cards is shuffled randomly. What is the expected number of cards that will be strictly between the two jokers?

Guest Jul 20, 2018

+1

25

1

+51

Some help with expected value...

MathCuber Jul 20, 2018

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23

1

how would i solve this radical equation?

Define $g$ by $g(x)=5x-4$. If $g(x)=f^{-1}(x)-3$ and $f^{-1}(x)$ is the inverse of the function $f(x)=ax+b$, find $5a+5b$.

Guest Jul 20, 2018

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22

1

Help with functions

Guest Jul 20, 2018

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28

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Suppose that a,b, and c are positive integers satisfying (a+b+c)^3 - a^3 - b^3 - c^3 = 150. Find a+b+c.

heureka ●●

Guest Jul 20, 2018

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27

2

Find the last 2 digits of 18^(37)

Here's the problem:

I already solved the answer for 15.a) which is m, what I need help is with part b. read more ..

Guest Jul 19, 2018

+1

26

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+5

Suppose f is a polynomial such that f(0) = 47, f(1) = 32, f(2) = -13, and f(3)=16. What is the sum of the coefficients of f? Please explain.

Alan ●

hellospeedmind Jul 19, 2018

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39

1

Finding the exact perimeter of a square inscribed in a circle?

Six 6-sided dice are rolled. What is the probability that three of the dice show prime numbers and the rest show composite numbers?

Guest Jul 18, 2018

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29

3

???help please

In this problem, a and b are positive integers. When a is written in base 9, its last digit is 5. When b is written in base 6, its last two digits are 53. When a-b is written in base 3, what are its last two digits? Assume a-b is read more ..

Guest Jul 18, 2018

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help

how to delete a widget?

Guest Jul 18, 2018

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help please

1. What is the sum of all integers that satisfy ?
2. Find all real numbers such that . Give your answer as an interval.
Thanks!

Guest Jul 18, 2018

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26

0

What is the sum of all integers x that -5 <= x/π <= 10 satisfy ?

Guest Jul 18, 2018

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25

1

Please help me

Define $g$ by $g(x)=5x-4$. If $g(x)=f^{-1}(x)-3$ and $f^{-1}(x)$ is the inverse of the function $f(x)=ax+b$, find $5a+5b$.

10 fair six-sided dice are rolled. What is the probability of getting AT LEAST 5 threes? I thank you for any help.

Guest Jul 18, 2018

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43

2

More dice.....

How many ways are there to answer a 10-question true/false test, where at least 3 of the questions have been answered with a false?

I got 14 but that is incorrect.

Guest Jul 18, 2018

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52

7

help please

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Guest Jul 18, 2018

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43

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Conic Question

Circle gamma intersects the hyperbola y=1/x at (1,1), (3, 1/3) and two other points. What is the product of the y coordinates of the other two points?

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Guest Jul 17, 2018

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2 functuon questions

1. Let $r(\theta) = \frac{1}{1-\theta}$. What is $r(r(r(r(r(r(30)))))$ (where $r$ is applied $6$ times)?

2. If $f(a) = \frac{1}{1-a}$, find the product $f^{-1}(a) \times a \times f(a)$. (Assume $a \neq 0$ and $a \neq 1$.) read more ..

Guest Jul 17, 2018

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65

1

can someone please help please. Complete the similarity statement for the two polygons shown. Enter your answer in the box. ABCD∼

The function f satisfies f(sqrt x+1)=1/x. For all x is greater than or equal to -1, x is not equal to 0. What is f(2)?

Guest Jul 17, 2018

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37

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Does anyone know how to solve this?

Let f be a function such that f(x+y)=x+f(y) for any two real numbers x and y. If f(0)=2, then what is f(2012)?

Guest Jul 17, 2018

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30

1

How do you solve this problem?

Alan ●

Guest Jul 17, 2018

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27

1

Allen and Ben.

Allen and Ben are painting a fence. The ratio of the amount of work Allen does to the amount of work Ben does is . If the fence requires a total of square feet to be painted, how many square feet does Ben paint?

At your neighbouring school, 65% of the students are male and 35% are female. Of the male students,
10% report that dancing is their favourite activity; of the female students, 25% report that dancing is their favourite activity.
Find the probability read more ..

Guest Jul 17, 2018

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33

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Conditional Probability

the question says that
p>q>0

find the length of the line segment joining these paris of points. read more ..

Guest Jul 17, 2018

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34

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+4

i need help (A level maths)(coordinate geometry)

Scarface3010 Jul 17, 2018

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38

1

If f(x)=x^5-1/1, find f^-1(-31/96).

Here's the question & my work:

for #16.a) the tb answer is 6 km & for read more ..

Guest Jul 17, 2018

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31

1

Finding distance using absolute values?

https://web2.0calc.com/questions/function-help_4

Guest Jul 17, 2018

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28

2

Please help with linked question

A vertical pole is 15 ft high and the length of its shadow is 20 ft. What is the angle of elevation of the sun rounded to the nearest tenth of a degree?

Guest Jul 16, 2018

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32

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A vertical pole is 15 ft high

heureka ●

Guest Jul 16, 2018

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39

1

+109

help me

Suppose that we have an equation y=ax^2+bx+c whose graph is a parabola with vertex (3,2), vertical axis of symmetry, and contains the point (1,0). What is (a, b, c)?

Melody ●

xXxTenTacion Jul 16, 2018

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42

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Function help!

1. Let $f(x) = Ax - 2B^2$ and $g(x) = Bx$, where $B \neq 0$. If $f(g(1)) = 0$, what is $A$ in terms of $B$?
2. Suppose that $f$ is a function and $f^{-1}$ is the inverse of $f$. If $f(1)=2$, $f(2) = 6$, and $f(3)=5$, then what is $f^{-1}(f^{-1}(6))$? read more ..

Rectangle ABCD has center O and AB/AD=k. A point is randomly chosen from the interior of rectangle ABCD. What is the probability that it is closer to O than to any of the four vertices?

Guest Jul 16, 2018

+2

42

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+51

Geometry Probability

The 1st line is the original expression:

and then i ended there because i wasn't sure what to do next. read more ..

MathCuber Jul 16, 2018

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31

1

Factoring this polynomial expression?

1. Three friends: Al, Bill, and Carl, are painting their chests with the word CAVALIERS for a basketball game, with at least two letters painted on each friend’s chest. For example, Al might get “CA”, Bill “VAL”, and Carl “IERS”, or Carl could get “CAVA” read more ..

Guest Jul 16, 2018

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43

3

Two counting problems

A park has a circular swimming pool. The diameter of the pool is 19ft. Whatis the distance traveled if you swim around the edge of the pool once? Use π ≈ 3.14.

Guest Jul 15, 2018

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27

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+67

circular swimming pool

Mathrules Jul 15, 2018

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37

1

Arithmetic Sequence

If the first term of an arithmetic sequence is 17 and the common difference is 6, what is the first term

Suppose that $f$ is a function and $f^{-1}$ is the inverse of $f$. If $f(3)=4$, $f(5)=1$, and $f(2)=5$, evaluate $f^{-1}\left(f^{-1}(5)+f^{-1}(4)\right)$.

Guest Jul 15, 2018

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28

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+357

Help!

Given f(n)=1/(n+1)+1/(n+2)+...+1/(3n+1). When you want to prove the question using the mathematical induction method. For step 2, if n=k, you want to validate when n=k+1, then the relationship between f(k) and f(k+1) will be?

Thank read more ..

Lightning Jul 15, 2018

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35

1

+68

Please help on this induction question!

yasbib555 Jul 15, 2018

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29

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+68

deleted

If $P(x) = 4+2\sqrt{x+2}$ and $G(x) = 4-3x$, then what is the largest constant $a$ such that $P(G(a))$ is defined?

yasbib555 Jul 15, 2018

+1

33

1

+357

Help!

Suppose that x,y,z are positive integers satisfying x≤y≤z, and such that the product of all three numbers is twice their sum. What is the sum of all possible values of z?

Lightning Jul 15, 2018

+1

35

2

+109

HELP ASAP

Suppose that $f$ is a function and $f^{-1}$ is the inverse of $f$. If $f(3)=4$, $f(5)=1$, and $f(2)=5$, evaluate $f^{-1}\left(f^{-1}(5)+f^{-1}(4)\right)$.

xXxTenTacion Jul 15, 2018

0

35

1

+357

Help!

If $t(x) = |{-3+2x}|$, then what is $t(t(-4))$?

Lightning Jul 15, 2018

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28

1

+357

Help!

Let $f(x) = 3x-8$ and $g(f(x)) = 2x^2 + 5x - 3.$ Find $g(-5).$

Lightning Jul 15, 2018

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28

1

+357

Help!