All Questions

276

Complex Number Problem (Help)

Let z be a complex number such that z^5 = 1 and z does not equal 1. Compute z + 1/z + z^2 + 1/z^2

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Guest May 9, 2022

246

math help please!!

Zach painted 92 square feet in the same amount of time that Blaise painted 13,500 square inches. How many more square inches did the person who painted more

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Guest May 9, 2022

259

Clara is jogging at a speed of 1.5 meters per second. What is her speed in kilometers per hour?

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Guest May 9, 2022

242

Money matters

A sum of money is divided among Alice, Bob and Carl. If the ratio is 13:12:7, how much does Bob get if the amount that Alice gets is $360 more than Carl? And what is the total amount of money that was divided? Thanks for help.

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Guest May 9, 2022

282

help algebra

If we write $\sqrt{2}+\frac{1}{\sqrt{2}} + \sqrt{3} + \frac{1}{\sqrt{2}}$ in the form $\dfrac{a\sqrt{2} + b\sqrt{3}}{c}$ such that $a$, $b$, and $c$ are positive integers and $c$ is as small as possible, then what is $a+b+c$?

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Guest May 9, 2022

321

what rate of interest compounded continuously is required to double an investment in 3 years?

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Guest May 9, 2022

May 8, 2022

228

math problem

Andy bought 2 flash drives for $10 each. Two days later, the price and increased by 1/4, but he bought two more anyway. What was his total cost for the 4 flash drives?

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Guest May 8, 2022

306

Please help

Students are donating money to a charity fund that helps less privileged kids. The number of $2, $5 and $10-notes donated are in the ratio of 9:2:5. 4/9 of the $2-notes and 10 $5-notes are taken out. The remaining notes are worth $300. How many $10-notes read more ..

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Guest May 8, 2022

311

Choosing numbers from a bag

A bag contains one of each of the four numbers 2, 3, 4, and 5. How many integers can be written as the product of two or more numbers chosen from the bag? (For example, 30 can be written as 2 * 3 * 5.)

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Guest May 8, 2022

281

Algebra

If (2x - 3y)^2 = 4 and xy = -5, what is the value of 4x^2 + 9y^2?

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Guest May 8, 2022

280

Algebra

The expression 3y^2-y-24+10 can be written as (3y + a)(y + b), where a and b are integers. What is a-b?

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Guest May 8, 2022

280

Average speed

A passenger plane flew from NY city to Los Angeles non-stop in 5 equal distances at the following average speeds for each distance: 600 km/h, 750 km/h, 800 km/h, 650 km/h and 825 km/h. What was the average speed of the plane from NY to LA? Thank you. read more ..

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Guest May 8, 2022

272

Function

Let
f(x) = x if x is rational
f(x) = x^2 if x is irrational
Find f(-8) + f(-pi) + f(50) + f(9/2) read more ..

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Guest May 8, 2022

278

Graphing question

Find the area of the region satisfying the inequality x^2 + y^2 <= 4x + 6y+13 + 10x +2y

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Guest May 8, 2022

261

graphing question

The graph of y=f(x) is shown below in red. For which x value does f(x)=4
Assume grid lines are spaced 1 unit apart

read more ..

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Guest May 8, 2022

290

help plz

Find the y-intercept of the graph x^2 - 10x + y^2 - 10y + 25 = -10x - 10y + 25. Write your answer as an ordered pair.

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Guest May 8, 2022

267

Coordinates

The equation x^2 + 6x + y^2 + 6y = 18 + 2x - 10y represents a circle. What is its center? Write your answer as an ordered pair.

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Guest May 8, 2022

274

math problem

If we letf(n) denote the sum of all the positive divisors of the integer n, how many intergers i exist such that 1 <= i <= 2010 and ?

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Guest May 8, 2022

267

Graphing question

Given that the point (9,7) is on the graph of y=f(x), there is one point that must be on the graph of y/2= f(x)-3. What is the sum of coordinates of that point?

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Guest May 8, 2022

266

Geometry

In the diagram, the area of rectangle EFGH is of the area of unit square ABCD. What is the area of quadrilateral AFCH in square units?

read more ..

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Guest May 8, 2022

251

Graph question

the graph of y=f(x) is shown below, in red. Find the equation that corresponds to the blue graph.
Enter your answer in the form "y=..."

read more ..

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Guest May 8, 2022

290

Help with Complex Number Arithmetic

Let z be a complex number such that . Compute

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Guest May 8, 2022

287

geometric sequence

What is the sum of the geometric sequence 2, 10, 50, ... if there are 7 terms?

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Guest May 8, 2022

304

Polynomial

Expand the product (x - 2)^2 (x + 2)^3. What is the product of the nonzero coefficients of the resulting expression, including the constant term?

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Guest May 8, 2022

268

Quadratic

The equation x^2 + ax = -14 - 6 - 8x has only integer solutions for x. If a is a positive integer, what is the greatest possible value of a?

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Guest May 8, 2022

All Questions ⁺⁰236399 Questions

Complex Number Problem (Help)

math help please!!

Clara is jogging at a speed of 1.5 meters per second. What is her speed in kilometers per hour?

Money matters

help algebra

what rate of interest compounded continuously is required to double an investment in 3 years?

math problem

Please help

Choosing numbers from a bag

Algebra

Algebra

Average speed

Function

Graphing question

graphing question

help plz

Coordinates

math problem

Graphing question

Geometry

Graph question

Help with Complex Number Arithmetic

geometric sequence

Polynomial

Quadratic

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