All Questions ⁺⁰238459 Questions

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330

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Algebra

The equation y = -16t^2 - 60t + 54 describes the height (in feet) of a ball thrown downward at 60 feet per second from a height of 54 feet from the ground, where t represents time, measured in seconds. In how many seconds will the ball reach a read more ..

Guest Jul 13, 2022

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352

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Percent

The table shows the percent of families in Mathville that have 0, 1, 2, 3 and 4 or more children. If there are a total of 10,250 families, how many are there with no children?

Number of children 0 1 2 3 4+ read more ..

Guest Jul 13, 2022

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307

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Graphing parabolas

The graph of the line y = 3x + a intersects the graph of the parabola y = x^2 + x in two points. If the distance between these points is sqrt(30), what is the value of a? Express your answer as a common fraction.

Guest Jul 13, 2022

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262

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help quadratic

The polynomial p(x) = x^2 + ax + b has positive integer coefficients a and b. If p(80) is a perfect square and the equation p(x) = 0 has two distinct integer solutions, what is the least possible value of b? read more ..

Guest Jul 13, 2022

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257

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Counting

How many different subsets of {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12} contain at least one element in common with each of the sets {2, 4, 6, 8, 10, 12}, {4, 8, 12} and {2, 3, 5, 7, 11}

Guest Jul 13, 2022

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280

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Counting

Riley has a stack of ten cards. On the nth card, n consecutive letters starting with the nth letter of the alphabet are printed. For example, on the first card, the letter A is printed. On the second card, the letters BC are printed. On the third card, read more ..

Guest Jul 13, 2022

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360

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function

Let f(x) = 1/(x - 3). Find the largest x that is not in the domain of g(x) = f(x)*f(x)

Guest Jul 13, 2022

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267

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help graphing

What is the smallest distance between the origin and a point on the graph of y = \frac{1}{\sqrt{2}} (x^2 - 18)

Guest Jul 13, 2022

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266

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counting

A haiku is a poem with three lines: the first line contains 5 syllables, the second line 7 syllables, and the last line 5 syllables. If each word in each list shown is used at most once, how many different haiku can be made with these read more ..

Guest Jul 13, 2022

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252

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function

If
f(x) = 2x - 5 if x >= 3
f(x) = 5x - 1 if x < 3
then for how many values of x is f(f(x)) = 3? read more ..

Guest Jul 13, 2022

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344

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trig question

Calculate

As usual, the output of an inverse trig function should be in radians.

Guest Jul 13, 2022

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354

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Counting

A solid 6-by-6-by-6 cube is constructed from unit cubes and the entire outer surface is painted. What fraction of the unit cubes has zero painted faces? Express your answer as a common fraction.

Guest Jul 13, 2022

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261

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Proportion

In physics, Ohm's law says that current through a wire, I, is directly proportional to voltage, V, and inversely proportional to resistance, R:
I = V/R
It's also true that resistance is directly proportional to the length of the wire. We read more ..

Guest Jul 13, 2022

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346

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Rationalizing Denominators

Rationalize the denominator of . With your answer in the form , and the fraction in lowest terms, what is A + B + C +D ?

Guest Jul 13, 2022

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265

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plz help

What is the smallest value of x that satisfies the equation 8x^2 - 38x - 35 = 0? Express your answer as a decimal.

Guest Jul 13, 2022

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336

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help with percent

https://web2.0calc.com/questions/percent_97

Guest Jul 13, 2022

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348

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operations

Let a * b = ab/(a - b). What is the value of (1*2)*3? Express your answer as a common fraction.

Guest Jul 13, 2022

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339

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linear equations

If 4u-5v=23 and 2u+4v=-8+4u, find the value of u+v.

Guest Jul 13, 2022

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337

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linear equations

If 5 = -4b + 5 and 3a = -2b + 3 + 6b, what is b?

Guest Jul 13, 2022

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580

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+12

I'm quite stuck here. Anyone?

NOTE: I know this has been solved before, but I didn't understand the previous user's solution, so I'm asking again. Thanks!
Let n be a positive integer.

Prove that read more ..

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AngrySesame Jul 13, 2022

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317

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A confusing combinatorics problem

The 10 students in my physics class sit at a round table in the following manner: The students line up in alphabetical order. The student whose name is first sits anywhere she wants. Each subsequent student chooses a chair that is next to a student who read more ..

Guest Jul 13, 2022

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361

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Help Me!

Guest Jul 13, 2022

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370

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Help!

Expand the product

Guest Jul 13, 2022

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258

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Algebra

For what ordered pair (a,b) are there infinite solutions (x,y) to the system
2ax + 2y = b
5x + y = -3 - x + 4y

Guest Jul 13, 2022

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