All Questions

272

+75

Geometry HELP

In the following 9-star, find the sum of the angles ∠A+∠B+∠C+∠D+∠E+∠F+∠G+∠H+∠I

BuilderBoi ●

HelpMePlssss Jun 27, 2022

282

complex numbers

If z is a complex number satisfying z + 1/z = 1, calculate z^2 + 1/z^2.

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Guest Jun 27, 2022

279

Algebra

If x - y = sqrt(3) and x + y = 2, then xy = ?

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Guest Jun 27, 2022

198

help

Suppose that $\Join$ is an operation defined by $x \Join y = (x+2)(y-3)$. What is $((t) \Join (t+2)) - ((t+1) \Join (t+1))$?

Guest Jun 27, 2022

286

geometric series

Consider the geometric series 4 + 20/a + 100/a^2 + .... If the sum is a perfect square, what is the smallest possible value of a where is a positive integer?

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Guest Jun 27, 2022

266

trig

Find BC in the following triangle, to two decimal places.

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Guest Jun 27, 2022

238

Find a linear inequality with the following solution set. Each grid line represents one unit.

Find a linear inequality with the following solution set. Each grid line represents one unit.

read more ..

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Guest Jun 27, 2022

282

Analytic geometry

Let P and Q be constants. The graphs of the lines x + 5y = 7 and 15x + Py = Q are perpendicular and intersect at the point (-8,8). Enter the ordered pair (P,Q).

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Guest Jun 27, 2022

280

Divisors

How many even divisors does 7! + 6! have?

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Guest Jun 27, 2022

272

3d geometry

A circular sheet of paper of radius 6 inches is cut into 4 equal sectors, and each sector is formed into a cone with no overlap. What is the height in inches of the cone?

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Guest Jun 27, 2022

255

help with coordinates

What is the area, in square units, of the interior region formed by the lines y = 4x - 6, y = -2x + 8, and the y-axis?

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Guest Jun 27, 2022

259

beginner algebra interval question

Jeri finds a pile of money with at least $200. If she puts $80 of the pile in her left pocket, gives away 1/3 of the rest of the pile, and then puts the rest in her right pocket, she'll have more money than if she instead gave away $200 of the read more ..

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Guest Jun 27, 2022

262

sequence

the sequence 12,15, 18, 21, 51, 81,... consists of all positive multiples of 3 that contain at least one digit that is a 1. what is the 10th term of this sequence?

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Guest Jun 27, 2022

284

quadratic

What real value of t produces the smallest value of the quadratic t^2 -9t - 36 + t^2 - t + 24?

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Guest Jun 27, 2022

267

help quadratic

Let a and b be the solutions to 5x^2 - 11x + 4 = 0. Find 1/(a + b).

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Guest Jun 27, 2022

264

Coordinates

Find y if the point (-6,y) is on the line that passes through (-1,7) and (3,2).

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Guest Jun 27, 2022

241

help sum

Compute \[\frac{1}{2^3 - 2} + \frac{1}{3^3 - 3} + \frac{1}{4^3 - 4} + \dots + \frac{1}{6^3 - 6}.\]

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Guest Jun 27, 2022

277

quadratic

The graph of a certain quadratic y = ax^2 + bx + c is a parabola with vertex (-4,0) which passes through the point (1,-7). What is the value of a?

BuilderBoi ●

Guest Jun 27, 2022

237

Number theory

For how many positive integers n is 4n^2 - 1 a prime number?

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Guest Jun 27, 2022

187

coordinates

Trapezoid ABCD has vertices A(-1,0), B(0,5), C(m,3) and D(k,0), with m > 0 and k > 0. The line y = -x + 4 is perpendicular to the line containing side CD, and the area of trapezoid is 34 square units. What is the value of k?

Guest Jun 27, 2022

256

circles

Let AB and CD be chords of a circle, that meet at point Q inside the circle. If AQ=6 ,BQ=12 and CD=38, then find the minimum length of CQ.

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Guest Jun 27, 2022

313

+273

Geometry circumradius

Find the circumradius of the triangle ABC.

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TheEarlyMathster Jun 27, 2022

273

quadratic inequality

What is the value of b+c if x^2+bx+c>0 only when x is (-inf, -2) U (2, inf)?

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Guest Jun 27, 2022

275

parabolas

The parabolas defined by the equations y=-x^2-x+1 and y=2x^2-7 intersect at points (a,b) and (c,d), where c\ge a. What is c-a?

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Guest Jun 27, 2022

319

Peanut Probability

A bag of peanuts in their shells contains 174 peanuts. 72 of the shells contain one peanut, 97 of the shells contain two peanuts, and the rest contain three peanuts. Of the shells with one peanut, 18 of them are cracked. Of the shells with two peanuts, read more ..

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Guest Jun 27, 2022

All Questions ⁺⁰237313 Questions

Geometry HELP

complex numbers

Algebra

help

geometric series

trig

Find a linear inequality with the following solution set. Each grid line represents one unit.

Analytic geometry

Divisors

3d geometry

help with coordinates

beginner algebra interval question

sequence

quadratic

help quadratic

Coordinates

help sum

quadratic

Number theory

coordinates

circles

Geometry circumradius

quadratic inequality

parabolas

Peanut Probability

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