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Post New Question
All Questions
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230654 Questions
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193
1
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
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Guest
Jul 13, 2022
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210
1
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+
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Guest
Jul 13, 2022
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272
2
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.
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Guest
Jul 13, 2022
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141
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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?
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Guest
Jul 13, 2022
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124
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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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153
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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,
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Guest
Jul 13, 2022
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211
1
function
Let f(x) = 1/(x - 3). Find the largest x that is not in the domain of g(x) = f(x)*f(x)
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Guest
Jul 13, 2022
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133
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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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134
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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
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Guest
Jul 13, 2022
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134
0
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?
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Guest
Jul 13, 2022
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203
1
trig question
Calculate
As usual, the output of an inverse trig function should be in radians.
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Guest
Jul 13, 2022
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206
1
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.
BuilderBoi
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Guest
Jul 13, 2022
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135
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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
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Guest
Jul 13, 2022
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205
1
Rationalizing Denominators
Rationalize the denominator of . With your answer in the form , and the fraction in lowest terms, what is A + B + C +D ?
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Guest
Jul 13, 2022
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131
0
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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194
1
help with percent
https://web2.0calc.com/questions/percent_97
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Guest
Jul 13, 2022
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204
1
operations
Let a * b = ab/(a - b). What is the value of (1*2)*3? Express your answer as a common fraction.
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Guest
Jul 13, 2022
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200
1
linear equations
If 4u-5v=23 and 2u+4v=-8+4u, find the value of u+v.
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Guest
Jul 13, 2022
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203
1
linear equations
If 5 = -4b + 5 and 3a = -2b + 3 + 6b, what is b?
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Guest
Jul 13, 2022
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477
5
+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
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AngrySesame
Jul 13, 2022
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241
3
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
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Guest
Jul 13, 2022
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219
1
Help Me!
Factor
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Guest
Jul 13, 2022
0
230
1
Help!
Expand the product
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Guest
Jul 13, 2022
0
129
0
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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