All Questions ⁺⁰237665 Questions

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361

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Base Numbers

What is the average of all positive integers that have four digits when written in base 3, but two digits when written in base 5? Write your answer in base 10.

Guest Dec 15, 2021

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283

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Algebra

Let a, b, c be the roots of x^3 - x - 1 = 0. Compute
(1 + a)^2/(1 - a) + (1 + b)^2/(1 - b) + (1 + c)^2/(1 - c).

Guest Dec 15, 2021

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382

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Biology.

The surface area of a sphere can be approximated as followed: 4(pi symbol)r^2 ; where r is the radius of the sphere; (pi symbol) is a constant that's roughly equal to 3. Using the approximation as told, calculate the surface area of a sphere with a radius read more ..

Guest Dec 15, 2021

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381

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trig question

Find the measure, in degrees, of the smallest positive angle $\theta$ for which $\sin 3 \theta = \cos 17 \theta$.

Guest Dec 15, 2021

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391

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Math

Joe, Alex and Sean shared some stamps in the ratio 3:8:5. Sean kept
1/5 of his stamps for himself and gave the rest of his stamps to Joe and
Alex in the ratio 3:5. As a result, Alex had 96 stamps more than Joe.
How many stamps read more ..

Guest Dec 15, 2021

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291

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Sum

Evaluate the sum 1/3^1 - 2/3^2 + 3/3^3 - ... + (-1)^(k - 1)*k/3^k + ... .

Guest Dec 15, 2021

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377

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Geometry

In triangle ABC, AC = BC, angle DCB is 40 degrees, and CD is parallel to AB. What is the number of degrees in angle ACB?

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Guest Dec 15, 2021

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264

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math grade 5 world problem

iker dose pushups everyday this week he wants to do 4 more pushups each day than the day before how many pushups will iker do each weekday if he dose 25 pushups on monday?

Guest Dec 15, 2021

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437

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Geometry

In the diagram, P is on RS so that QP bisects < SQR. Also, PQ=PR, < RSQ=2y degrees, and < RPQ=4y degrees. What is the measure, in degrees, of < RPQ?

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397

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Help! Thanks!

In , shown, . What is ?

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365

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Number Theory

How many different triples (a,b,c) from the set {1,2,3,4,5} satisfy the equation a^2 + bc = b^2 + bc?

Guest Dec 15, 2021

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239

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Geometry question

In a parallelogram, let's call it ABCD, let points E and F be the midpoints of sides AB and BC respectively. Find the ration of AP:AF, where P is the intersection of segments AF and CE

Guest Dec 15, 2021

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291

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Counting problem

The 5*5 grid shown contains a collection of squares with sizes from 1*1 to 5*5. How many of these squares contain the black square?

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Guest Dec 15, 2021

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336

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How to get better at math?

This isn't a question for an equation or anything, but I really needs some tips on how to get better at math. I'm in 11th grade, & I still can't pass through algebra 1 . I began struggling with math in the 3rd grade, and since then I've always been read more ..

Guest Dec 15, 2021

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245

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Coordinates

Two circles of radius r are externally tangent to each other and internally tangent to the ellipse x^2 + 2y^2 = 6 as shown below. Find r.

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Guest Dec 15, 2021

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239

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MATH HELP!!!

Tell whether the triangle with each set of side lengths is a right triangle.(1.) 0.9, 1.2, 1.5 (2.) 3.1, 5.7, 7.1 (3.)1, 2.4, 2.6

Guest Dec 15, 2021

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263

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ask

How much it's 2.13604289e-9

Guest Dec 15, 2021

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352

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linear regression model

can somneone help with a linear regression model equation?

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271

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EQUATION

Guest Dec 15, 2021

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369

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Polynomial

Find all the roots of the polynomial f(x) = x^4-5x^3+5x^2+17x-42 - x^4 + 5x^3 - 4x^2 - 16x + 20.

Guest Dec 15, 2021

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382

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Number Theory

Find the largest prime divisor of 11! + 12! + 13!.

Guest Dec 15, 2021

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599

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math

The endpoints of a diameter of a circle are (7,−4) and (−3,2).
What is the equation of the circle in standard form?
Enter your answer by filling in the boxes. Enter any fractions in simplified form.

Guest Dec 15, 2021

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256

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polygon problem

There is a point inside a polygon such that if you rotate the polygon around that point clockwise by 50 degrees, the polygon coincides with itself. What is the minimum number of vertices that this polygon can have?

Guest Dec 15, 2021

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