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307

Math test prepare

A theater group made appearances in two cities. The hotel charge before tax in the second city was $1000 lower than in the first. The tax in the first city was 7.5%, and the tax in the second city was 9.5% . The total hotel read more ..

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Guest Mar 14, 2022

349

+72

How does this turn into... Harmonic Numbers?!

Define the following statistic as follows:
:

Start at . Go back from until you get to the nearest element of the list smaller than it. Suppose that the first element smaller than it is . read more ..

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jsaddern Mar 14, 2022

314

ratios

Winnie likes her lemonade to have a water:lemon juice ratio of 7:2. Lizzie prefers a water: lemon juice ratio of . How much water would Lizzie have to add to 450 gallons of Winnie's lemonade in order for it to be to her liking?

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Guest Mar 14, 2022

Mar 13, 2022

308

+31

Really fun conditions problem

Find all integers such that the arithmetic mean of all its factors is an integer.

Thanks so much!

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ibhar Mar 13, 2022

445

Find the simple interest on 20,000 borrowed on May 1 and will be paid after 6months at 6.25% interest using exact time.

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Guest Mar 13, 2022

347

+218

Wierd Question on Subets

Consider the following set of symbols.

The number of subsets of this set which contain the ₯ symbol is? read more ..

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MathyGoo13 Mar 13, 2022

311

help please

If $12^2 \cdot 18^3 = 2^x \cdot 3^y$, find $x+y$.

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Guest Mar 13, 2022

273

counting

A palindrome is a number which reads the same forward as backward. How many five-digit palindromes can be made from the digits 1, 2, 3, 4, and 9? (Each digit may be used more than once.)

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Guest Mar 13, 2022

340

help counting

How many 4-digit numbers have the second digit even and the fourth digit is at most twice the second digit? (Here, digits are read from the left, so the first digit is the leftmost digit, and so on.)

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Guest Mar 13, 2022

349

+53

Hard question

From the vertex A of the base of a right-angled triangle ABC is constructed the bisector of the angle CAB which intersects the side BC at point D. The point E is at half of the side AC (E E AC). If the angle at the vertex is 36º, then find the measure of read more ..

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arturfetahu Mar 13, 2022

294

help geometry

In right triangle PQR, we have angle Q=angle R and PR= 6. What is the area of triangle PQR?

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Guest Mar 13, 2022

409

helppppp

The gravitational force that Earth exerts on an object is inversely proportional to the square of the distance between the center of the Earth and the object. When Bill is on the surface of Earth, 4,000 miles from the center, the gravitational force is read more ..

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Guest Mar 13, 2022

334

statistics and probability

With four yellow caps, and seven orange caps, how many ways can eleven boys be provided with caps?

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Guest Mar 13, 2022

192

Statistics and probability

how many ways can johann seat himself and eight of his classmates around a table?

Guest Mar 13, 2022

240

HALP

We call a number peachy if every digit in the number is either a 3 or next to a 3 For example, the numbers 333, 83, and 333 are all peachy, but the numbers 32523, 340, and 3999 are not peachy.
How many positive 2-digit read more ..

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Guest Mar 13, 2022

189

help, please!

Let
For how many integers from 1 to 100, inclusive, does for some number of applications of ?

Guest Mar 13, 2022

323

Help

At the start of the game, Peter and Jack had 48 marbles altogether. In the first round, Peter lost 2/5 of his marbles to Jack. In the second round, Jack lost 1/9 of his marbles to Peter. At the end of the second round, they had the same number of marbles. read more ..

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Guest Mar 13, 2022

-5

856

+118687

HAPPY ANNIVERSARY CHRIS! (CPhill)

I just realized that you became a member here exactly 8 years ago today!

It has been great to have you here all that time

Cool elegant problem that combines many concepts!

Hello!

Show that for all perfect squares such that we can express:
read more ..

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jsaddern Mar 13, 2022

341

+31

Proof - distribution of primes!

Hello!

Prove that for all , the number of primes from to inclusive, is greater than .
read more ..

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ibhar Mar 13, 2022

Mar 12, 2022

319

Number Theory

Given positive integers x and y such that x not equal to y and 1/x + 1/y = 1/18 + 1/18, what is the smallest possible value for x + y?

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Guest Mar 12, 2022

316

hep geometry

In the diagram below, we have ST = 2*TR + 5 and PQ = SR = 30. Find the length UV.

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Guest Mar 12, 2022

326

need help

placing $300 in a 7.5% account compounded monthly for ten years. what is the final amount in ten years

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Guest Mar 12, 2022

314

please help preparing for a math test

how much you need to deposit today in a 4% account compounded quarterly to have $5000 at the end of ten years.

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Guest Mar 12, 2022

All Questions ⁺⁰236046 Questions

Math test prepare

How does this turn into... Harmonic Numbers?!

ratios

Really fun conditions problem

Find the simple interest on 20,000 borrowed on May 1 and will be paid after 6months at 6.25% interest using exact time.

Wierd Question on Subets

help please

counting

help counting

Hard question

help geometry

helppppp

statistics and probability

Statistics and probability

HALP

help, please!

Help

HAPPY ANNIVERSARY CHRIS! (CPhill)

Cool elegant problem that combines many concepts!

Proof - distribution of primes!

Number Theory

hep geometry

need help

please help preparing for a math test

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