All Questions ⁺⁰237665 Questions

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296

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Help Percentage

Ajax buys 20 shares of stock at $\$20$ per share. The shares increase in value by $20\%$. He then sells 10 shares. After the shares decrease in value by $15\%$, he buys another 20 shares. The shares then all increase by $60\%$. Determine the total dollar read more ..

Guest Jun 14, 2021

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340

1

Help counting

How many non-empty subsets of {1, 2, 3, 4, 5} consist entirely of prime numbers? (We form a subset of the group of numbers by choosing some number of them, without regard to order. So, {1, 2, 3} is the same as {3, 1, 2}.)

Guest Jun 14, 2021

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318

1

Help with Number Theory

Given that x is a positive integer less than 6, how many values can k take on such that 3x = k (mod9) has no solutions in x?

Guest Jun 14, 2021

+1

442

1

Geometry

Two long strips of paper are each 2 inches wide, and they overlap so that the angle between the strips is 45 degrees. What is the number of square inches in the area of the parallelogram formed by the overlap?

ElectricPavlov ●

Guest Jun 14, 2021

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460

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+45

Help fast!!!

complete the square of

amc81012 Jun 14, 2021

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391

1

Probability

The integers r and k are randomly selected, where 3 < r < 6 and 1 < k < 8. What is the
probability that the division r/k is an integer value? Express your answer as a common fraction.

Guest Jun 14, 2021

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432

2

help counting

There are 7 dots on a circle. What is the maximal number of intersection points inside the circle created by connecting these points with lines?

Guest Jun 14, 2021

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313

2

Help please due TOMORROW

Ryan and Jai will squeeze lemons to get the juice needed to mix with the simple syrup to make the lemonade. Most lemons can be squeezed to produce two tablespoons of lemon juice. Sixteen tablespoons of juice are needed to fill one cup.
-Twenty-four read more ..

Guest Jun 14, 2021

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411

1

help counting

How many distinct odd-digit numbers can be written with the digits 1,2,3, 4 and 5 if no digit may be used more than once?

Guest Jun 14, 2021

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279

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Geometry

Let A_1 A_2 A_3 ... A_{10} be a regular polygon. A rotation centered at A_1 with an angle of a takes A_2 to A_{10}. Given that a < 180 degrees, find a, in degrees.

Guest Jun 14, 2021

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426

1

Help algebra

Let f(n) = n^2/(n^2 - n + 1).

Find the largest integer n such that f(2) * f(3) * f(4) * ... * f(n) < 1.98.

Guest Jun 14, 2021

Jun 13, 2021

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456

2

HelpPlease!

If $abc=13$ and$$\left(a+\frac{1}{b}\right)\left(b+\frac{1}{c}\right)\left(c+\frac{1}{a}\right)=\left(1+\frac{1}{a}\right)\left(1+\frac{1}{b}\right)\left(1+\frac{1}{c}\right),$$find $a+b+c$.

Guest Jun 13, 2021

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408

3

Quadratic

Find a so that ax^2 + 15x + 4 + 3x + 5 is the square of a binomial.

Guest Jun 13, 2021

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407

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Geometry

Find the ratio of the area of a regular hexagon with sides of 1 unit to the area of an equilateral triangle with sides of 2 units. (Nots: "regular" means that all of the sides and angles are equal)

Guest Jun 13, 2021

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329

1

Help Function

Let
f(x) = k(x) if x > 2
f(x) = -3x + 8 if x <= 2
Find the function k(x) such that f(x) is its own inverse. read more ..

Guest Jun 13, 2021

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433

4

Binomial problem pls halp

Simplify $\dfrac{\dbinom{n}{k-1}}{\dbinom{n}{k-2}}$. Thank you!

Guest Jun 13, 2021

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561

3

+4

MAT-133

) Last year’s freshman class at Big State University totaled 5,303 students. Of those, 1,266 received a merit scholarship to help offset tuition costs their freshman year (although the amount varied per student). The amount a student received was N($3,458, read more ..

KatieSNHU Jun 13, 2021

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804

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Math

115 students choose to attend one of three after school activities: football, tennis or running. There are 54 boys.
52 students choose football, of which 25 are girls.
43 students choose tennis.
10 girls choose running.
A read more ..

Guest Jun 13, 2021

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401

1

Ratios

There are only blue pens ,green pens and red pens in a box. The ratio of the number of blue pens to number of green pens is 2:5. The ratio of the number of green pens to number of red pens is 4:1

Guest Jun 13, 2021

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507

5

Help geometry

Points L and M lie on a circle centered at O, and the measure of arc LM on this circle is 72 degrees. The circle passing through points O, L, and M is drawn. Find the measure of arc LPM on the larger circle, in degrees.
read more ..

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Guest Jun 13, 2021

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464

3

Help angle problem

What is the number of degrees in the acute angle formed by the hands of a clock at 6:50?

Guest Jun 13, 2021

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324

1

geometric sequence

Consider the geometric sequence 3, 3/2, 3/4, 3/8, ... . Find the eighth term of the sequence. Express your answer as a common fraction.

Guest Jun 13, 2021

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326

1

Probability

If a committee of six students is chosen at random from a group of six boys and four girls, what is the probability that the committee contains exactly two boys? Express your answer as a common fraction.

Guest Jun 13, 2021

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402

1

Help with algebra

Find all pairs x+y=10 of real numbers such that x + y = 10 and x^2 + y^2 = 52.
For example, to enter the solutions and (2,4) and (-3,9), you would enter "(2,4),(-3,9)" (without the quotation marks).

Guest Jun 13, 2021

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415

1

Counting

How many distinct triangles can be formed by selecting three vertices of a regular hexagon? (Triangles with different vertices are considered distinct even if they are congruent.)

Guest Jun 13, 2021

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