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Post New Question
All Questions
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230983 Questions
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211
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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
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Guest
Jun 14, 2021
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254
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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}.)
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Guest
Jun 14, 2021
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228
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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?
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Guest
Jun 14, 2021
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352
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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
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Guest
Jun 14, 2021
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373
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+45
Help fast!!!
complete the square of
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amc81012
Jun 14, 2021
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302
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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.
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Guest
Jun 14, 2021
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352
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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?
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Guest
Jun 14, 2021
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239
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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
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Guest
Jun 14, 2021
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322
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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?
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Guest
Jun 14, 2021
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204
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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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330
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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.
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Guest
Jun 14, 2021
Jun 13, 2021
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370
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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 $a+b+c$.
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Guest
Jun 13, 2021
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325
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Quadratic
Find a so that ax^2 + 15x + 4 + 3x + 5 is the square of a binomial.
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Guest
Jun 13, 2021
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328
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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)
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Guest
Jun 13, 2021
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248
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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.
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Guest
Jun 13, 2021
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337
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Binomial problem pls halp
Simplify $\dfrac{\dbinom{n}{k-1}}{\dbinom{n}{k-2}}$. Thank you!
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Guest
Jun 13, 2021
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483
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+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,
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KatieSNHU
Jun 13, 2021
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712
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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
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Guest
Jun 13, 2021
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316
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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
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Guest
Jun 13, 2021
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419
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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.
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Guest
Jun 13, 2021
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371
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Help angle problem
What is the number of degrees in the acute angle formed by the hands of a clock at 6:50?
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Guest
Jun 13, 2021
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244
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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.
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Guest
Jun 13, 2021
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241
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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.
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Guest
Jun 13, 2021
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317
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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).
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Guest
Jun 13, 2021
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326
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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.)
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Guest
Jun 13, 2021
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