All Questions

731

help

What is the residue modulo 13 of the sum of the modulo 13 inverses of the first 12 positive integers?

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Guest Dec 16, 2019

619

How many different non-congruent isosceles triangles can be formed by connecting three of the dots in a 4x4 square array of dots?

How many different non-congruent isosceles triangles can be formed by connecting three of the dots in a 4x4 square array of dots?

Two triangles are congruent if they have the same traced outline, possibly up to rotating and flipping. read more ..

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Guest Dec 16, 2019

568

help

Piont C lies on a circle one of whose diameter is AB. The bisector of angle CAB intersects BC at D and intersects the circle at E. If BD = 25 and CD = 7, find BE.

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Guest Dec 16, 2019

559

help

If and , then find in terms of a and b.

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Guest Dec 16, 2019

1003

help

Find the numerical value of sin (40) sin (80) + sin(80) sin (160) + sin (160) sin (320). (All angles are in degrees.)

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Guest Dec 16, 2019

655

I don't know how to approach this

There are 10 chairs in a circle, labelled from 1 to 10. Find the number of ways of choosing 3 of these chairs, so that no two chosen chairs are adjacent.
I know how to do this in a row but because this is a circle, i don't know how to account read more ..

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Guest Dec 16, 2019

-1

901

+1662

help

Four unit circles surround a smaller circle. Find the radius of the smaller circle.

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wiseowl Dec 16, 2019

-1

902

+1662

help

Points (-1,-3) and (5,1) are the endpoints of a diameter of a circle. What is the equation of the circle?

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wiseowl Dec 16, 2019

-1

758

+1662

help

The circle x^2 + y^2 + Ax + By + C = 0 passes through the origin, and has the same center as the circle x^2 + y^2 - 4x + 6y - 3 = 0. What is A + B + C?

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wiseowl Dec 16, 2019

566

Help please

The spherical coordinates of (-3, 4, -12) are . Find

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Guest Dec 16, 2019

-2

985

+30

/gone

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whoisjoe Dec 16, 2019

Dec 15, 2019

469

Please help

The graph of is shown below.

If we plot the graph of for , then what is the smallest value of M that still produces read more ..

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Guest Dec 15, 2019

853

+308

help

P, Q, and R are prime numbers such that 3P + 7Q + 15R = 102. What is Q?

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notsmart2.0 Dec 15, 2019

-1

781

+318

Pre Calc

Simplify logbase2 (8/sq rt 32).

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mharrigan920 Dec 15, 2019

1221

+308

HELP

If Joelle multiplied 792 by a positive integer and came up with a perfect square as her answer, then what is the smallest integer she could have multiplied 792 by?

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notsmart2.0 Dec 15, 2019

554

Two Questions about Trapezoids

Hi, I needed some help with these two trapezoid questions I couldn't understand.
1) ABCD is a trapezoid with bases AB and DC. We know that Angle C=60 Degrees and Angle D=45 Degrees. If AB=5-2sqrt3 and BC=4, what is read more ..

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Guest Dec 15, 2019

1313

help

A 5 ltr bucket of water is taken from a swamp. The water contains 75 mosquito larvae. A 200mL flask of water is taken from the bucket for further analysis. What is the probability that the flask contains at least one mosquito read more ..

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Guest Dec 15, 2019

438

help

A function is defined on the complex numbers by where and are positive real numbers. Each point in the image of is equidistant from the point and the origin. Given that find and

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Guest Dec 15, 2019

-1

778

+318

Pre Calc

Given f(x) = x^2−1/ 1−x
and g(x) = x + 2. Find and simplify f(g(2))−g(f(2)).

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mharrigan920 Dec 15, 2019

1226

+308

help

What is the largest prime number in the ten-number list 37,3737,373737,...,37373737373737373737

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notsmart2.0 Dec 15, 2019

617

help

Let and be real numbers. The complex number is a root of the quadratic What is the other root?

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Guest Dec 15, 2019

-1

797

+30

/gone

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whoisjoe Dec 15, 2019

621

+262

help!

Suppose that the least common multiple of the first 25 positive integers is equal to 26A7114B4C0. Find 100 * A + 10 * B + C.

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atlas9 Dec 15, 2019

All Questions ⁺⁰237642 Questions

help

How many different non-congruent isosceles triangles can be formed by connecting three of the dots in a 4x4 square array of dots?

help

help

help

I don't know how to approach this

help

help

help

Help please

/gone

Please help

help

Pre Calc

HELP

Two Questions about Trapezoids

help

help

Pre Calc

help

help

/gone

help!

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