All Questions

404

number theory

How many two-digit positive integers are congruent to 1 (mod 7)?

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Guest Oct 15, 2020

407

word problem

Two persons A and B have a total sum of $320. First, A gives 20% of what he has to B. Then B gives 20% of what he now has back to A . If the ratio of the final amount of person read more ..

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Guest Oct 15, 2020

351

algebra

Let f(x)=x^2-6x+4 and let g(f(x))=2x+3. What is the sum of all possible values of g(8)?

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Guest Oct 15, 2020

574

+1124

Hi friends,

Hi friends,

The below picture is taht of a line, y=2x and x=4
read more ..

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juriemagic Oct 15, 2020

411

number theory

Given that a is a multiple of 1428, find the greatest common divisor of a + 2 and a + 8.

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Guest Oct 15, 2020

381

Help

I don't know how to solve this.

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Guest Oct 15, 2020

613

+1124

Divide by derivative

Hi friends,

I understand that when we want to get x values for the following:
read more ..

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juriemagic Oct 15, 2020

1158

Work out the value of n 1/3 √ 32 = 2^n

Help?

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Guest Oct 15, 2020

553

+13

Combinatorics

How many ways are there to put 9 differently colored beads on a $3\times3$ grid if the purple bead and the green bead cannot be adjacent (either horizontally, vertically, or diagonally), and rotations and reflections of the grid are considered the same? read more ..

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MathBoyFarcastik Oct 15, 2020

705

Find all real solutions for $x$ in $$ 2(2^x- 1) x^2 + (2^{x^2}-2)x = 2^{x+1} -2 . $$

Find all real solutions for $x$ in $$ 2(2^x- 1) x^2 + (2^{x^2}-2)x = 2^{x+1} -2 . $$

I tried doing this problem and simplified it all the way to $x^2 + \frac{(2^{x^2-1} - 1)x}{2^x - 1}=1$.(sorry if you don't know latex) but I read more ..

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Guest Oct 15, 2020

586

+13

Combinatorics

If I choose four cards from a standard $52$-card deck, with replacement, what is the probability that I will end up with one card from each suit?

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MathBoyFarcastik Oct 15, 2020

392

please help

Two number cubes are rolled. Each number cube has sides numbered 1 through 6.

What is the probability that the outcome of the roll is an even sum or a sum that is a multiple of 5?

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Guest Oct 15, 2020

630

find the no. of 6 letter words that can be formed using letters of the word SQUARE such that U and A always appear together.

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Guest Oct 15, 2020

386

help plz

Let N,O be functions such that N(x) = 2*x^(1/3), and O(x) = x^2. What is N(O(N(O(N(O(3)))))?

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Guest Oct 15, 2020

686

+78

Geometry Question 2

The larger circle at the right has a radius 1.5 times the smaller circle. Compute the ratio fo the partial ring ABCD to the area of sector BOC.

The image is basically a circle inscribed in another circle. A and D are points on the read more ..

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Frooglie Oct 15, 2020

470

probability

A spinner is divided into four equal sections that are numbered 2, 3, 4, and 13. The spinner is spun twice.
How many outcomes have a product less than 20 and contain at least one even number?

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Guest Oct 15, 2020

738

+78

Geometry Question 1

Chord YZ of a circle with center O has length 12. The circumference of the circle is 24pi. Find the length of arc YZ.

TY!

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Frooglie Oct 15, 2020

690

geometry

Randy has a cube with an edge of 21 cm. From in the middle of one face of this cube Randy cuts out and removes a cube with an edge of 3 cm. Find the change in surface area of the original cube.

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Guest Oct 15, 2020

416

Ap calc

et f and g be differentiable functions such that f ′ ( 1 ) = 2 and g ′ ( 1 ) = 6 . if h ( x ) = 5 f ( x ) − 4 g ( x ) + 3 x 2 − 2 , what is the value of h ′ ( 1 ) ?

Guest Oct 15, 2020

400

geometry

A triangle has integer length sides. If two sides of the triangle are 11 and 19, how many possible lengths are there for the third side?

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Guest Oct 15, 2020

408

help please

A triangle with integer sides has perimeter 15. How many such non-congruent triangles are there? (A 3-4-5 triangle is considered congruent to a 3-5-4 triangle because we can reflect and rotate the triangles until they match up.)

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Guest Oct 15, 2020

958

RATIO HELP

Mr. James’ class has a ratio of 2 boys to 3 girls.
Ms. Singh’s class has a ratio of 1 girl to 2 boys.
Both classes have 30 students.
How many boys and girls are in each class?

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Guest Oct 15, 2020

1975

Aerospace

A Boeing 777 takes off from Denver Airport (1625 m elevation) where the pressure is 101.8 kPa. Assume that the takeoff speed is 99.4 m/s. This 777 has a takeoff weight of 2,897,229 N and its wing area is 418.9 m2. What is the minimum coefficient of lift read more ..

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Guest Oct 15, 2020

500

solve system

Solve the system
4x + y = 5
7x - 3y = 2

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Guest Oct 15, 2020

529

circle equation

For what value of c will the circle with equation x^2 - 10x + y^2 + 4y + c = 0 have a radius of length 1?

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Guest Oct 15, 2020

All Questions ⁺⁰237665 Questions

number theory

word problem

algebra

Hi friends,

number theory

Help

Divide by derivative

Work out the value of n 1/3 √ 32 = 2^n

Combinatorics

Find all real solutions for $x$ in $$ 2(2^x- 1) x^2 + (2^{x^2}-2)x = 2^{x+1} -2 . $$

Combinatorics

please help

find the no. of 6 letter words that can be formed using letters of the word SQUARE such that U and A always appear together.

help plz

Geometry Question 2

probability

Geometry Question 1

geometry

Ap calc

geometry

help please

RATIO HELP

Aerospace

solve system

circle equation

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