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230410 Questions
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274
1
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.
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Guest
Dec 15, 2021
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203
1
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).
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Guest
Dec 15, 2021
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292
1
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
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Guest
Dec 15, 2021
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291
1
trig question
Find the measure, in degrees, of the smallest positive angle $\theta$ for which $\sin 3 \theta = \cos 17 \theta$.
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Guest
Dec 15, 2021
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289
4
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
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Guest
Dec 15, 2021
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207
1
Sum
Evaluate the sum 1/3^1 - 2/3^2 + 3/3^3 - ... + (-1)^(k - 1)*k/3^k + ... .
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Guest
Dec 15, 2021
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282
1
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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184
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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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342
3
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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Guest
Dec 15, 2021
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313
3
Help! Thanks!
In , shown, . What is ?
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Guest
Dec 15, 2021
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279
2
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?
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Guest
Dec 15, 2021
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166
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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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200
1
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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249
1
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
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Guest
Dec 15, 2021
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168
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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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166
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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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183
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ask
How much it's 2.13604289e-9
Guest
Dec 15, 2021
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262
1
linear regression model
can somneone help with a linear regression model equation?
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Guest
Dec 15, 2021
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190
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EQUATION
ax2+bx+c=???
Guest
Dec 15, 2021
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291
1
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.
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Guest
Dec 15, 2021
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286
2
Number Theory
Find the largest prime divisor of 11! + 12! + 13!.
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Guest
Dec 15, 2021
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527
1
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.
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Guest
Dec 15, 2021
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181
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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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