Factor the polynomial completely.81x2 - 64
A. (9x + 8)2
B. (81x + 1)(x - 64)
C. (9x + 8)(9x - 8)
D. (9x - 8)2
Answer: C
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Solve the problem using Gaussian elimination.A company makes 3 types of cable. Cable A requires 3 black, 3 white, and 2 red wires. B requires 1 black, 2 white, and 1 red. C requires 2 black, 1 white, and 2 red. They used 100 black, 110 white and 90 red wires. How many of each cable were made?
A. 20 cable A 30 cable B 10 cable C B. 10 cable A 30 cable B 20 cable C C. 10 cable A 30 cable B 93 cable C D. 10 cable A 103 cable B 20 cable C
Find the constant of proportionality k, and write the linear function relating the two variables.Suppose that y is directly proportional to x. When x = 20, then y = 24.
A. k = 4; y = 4x
B. k = 4; y = x + 4
C. k = 
; y = 
x
D. k = 
; y = 
x
Divide.(16x5y4 - 10x2y2 - 6x3y) ÷ (-2x2y)
A. -8x3y4 - 5y2 - 3xy B. -8x3y3 + 5y + 3x C. -8x3y3 - 5y - 3x D. -8x3y3 + 5y + 3xy
Remove parentheses and simplify the expression.2 + 7(3 - 4m)
A. -4m + 23 B. -28m + 23 C. 28m + 23 D. -28m + 21