All Questions ⁺⁰237687 Questions

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366

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help 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 Jan 2, 2022

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403

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Counting problem

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 Jan 2, 2022

Jan 1, 2022

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417

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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 Jan 1, 2022

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341

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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.

Guest Jan 1, 2022

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306

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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?

Guest Jan 1, 2022

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306

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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 Jan 1, 2022

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325

3

HELP PLEASE

The first six rows of Pascal's triangle are shown below, beginning with row zero. Except for the 1 at each end, row 4 consists of only even numbers, as does row 2 .How many of the first 20 rows have this property? (Don't include row 0 or row 1).
<read more ..

Guest Jan 1, 2022

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305

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Counting

A committee is to be made up from a group of 10 candidates. The committee must consist of a chairperson, vice-chairperson and some (not necessarily nonzero) number of members-at-large. How many ways can the committee be chosen?

Guest Jan 1, 2022

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371

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Algebra

A bag contains 4 blue, 5 green and 3 red marbles. How many green marbles must be added to the bag so that at least 79 percent of the marbles are green?

Guest Jan 1, 2022

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394

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Polynomial

The polynomial f(x) has degree 3. If f(0) = 4, f(1)= -2 , f(3) = 0, and f(3) = 28, then what are the x -intercepts of the graph of f(x)?

Guest Jan 1, 2022

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332

2

HELP DUE VERY SOON!!!!

For how many integers n where is odd?

Guest Jan 1, 2022

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332

1

Counting problem

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 Jan 1, 2022

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391

1

Plz Help

One root of x^2 + 12x + k = 0 is twice the other root. Find k.

Guest Jan 1, 2022

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547

3

answerplzzz

A group of friends wants to go to the amusement park. They have no more than $390 to spend on parking and admission. Parking is $16.75, and tickets cost $34 per person, including tax. What is the maximum number of people who can go to the amusement park? read more ..

Guest Jan 1, 2022

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324

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Percent

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 Jan 1, 2022

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325

1

Base Numbers

How many of the 343 smallest positive integers written in base 7 use 4 as a digit?

Guest Jan 1, 2022

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308

1

Clock question

Find the time between two and three o'clock that the minute hand and hour hand of a clock are diametrically opposite.

Guest Jan 1, 2022

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358

1

need help

Find a and b if a^2 - b^2 = 704 and a + b = 44.

Guest Jan 1, 2022

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368

1

Please help!!

One root of x^2+12x+k=0 is twice the other root. Find k

Guest Jan 1, 2022

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1

388

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Polynomials

The polynomial f(x) has degree 3 if f(-1)=15, f(0)=0, f(1)=5, f(2)=0, then what are the x-intercepts of the graph of f?

Guest Jan 1, 2022

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1

358

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coordinates

For what value of c will the circle with equation x^2 + 6x + y^2 - 14y + c = 0 have a radius of length 4?

Guest Jan 1, 2022

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1

389

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Counting problem

The Rotokas of Papua New Guinea have twelve letters in their alphabet. The letters are: A, E, G, I, K, O, P, R, S, T, U, and V. Suppose license plates of five letters utilize only the letters in the Rotoka alphabet. How many license plates of five letters read more ..

Guest Jan 1, 2022

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330

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help

Vlad (the vampire) wanted to line the inside of his cof􏰀in bed with purple cloth. He measured the inside height, length and width to be twenty-three inches, eighty-four inches and twenty- eight inches. He also noted that it was a rectangular prism. The read more ..

Guest Jan 1, 2022

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321

1

Overlapping hemispheres.

Suppose that points are selected on the surface of a sphere.

Each point "induces" a hemisphere of the sphere. That is, it defines a hemisphere "centered" at that point (i.e. the "top" / "pole" of the hemisphere read more ..

Guest Jan 1, 2022

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329

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Math

For St. Patrick’s Day, Mrs. G’s sixth grade class was given a choice of four different drinks. One- quarter of the class chose the green milkshakes, one-third of the class chose the green ginger ale, one-eighth of the class chose the green milk and one-sixth read more ..

Guest Jan 1, 2022

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