Given the values of x and y, find an equation of variation in which y varies directly as x.y = 21, when x = 3
A. y = 8x
B. y = 
C. y = 7x
D. y = 21x
Answer: C
Mathematics
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Find the exact value of the expression.sin (-2040°)
A. 
B. -1
C. 
D. 
Mathematics
Simplify the expression. Write the answer with positive exponents only. Assume that all variables represent positive real numbers.
A. x1/4 B. x1/2 C. x3/16 D. x1/8
Mathematics
Determine the x values that cause the function to be (a) zero, (b) undefined, (c) positive, and (d) negative.f(x) = x
A. (a) {0}, (b) (-?, 0), (c) (0, ?), (d) ? B. (a) {-9}, (b) (-?, -9), (c) (-9, ?), (d) ? C. (a) {-9, 0}, (b) (-?, -9), (c) (-9, 0), (d) (0, ?) D. (a) {-9, 0}, (b) (-?, -9), (c) (0, ?), (d) (-9, 0)
Mathematics
Using the horizontal-line test, determine whether the function is one-to-one.
A. one-to-one B. not one-to-one
Mathematics