Simplify the expression. Write your answer without negative exponents. Whenever an exponent is negative or zero, assume that the base is not zero.
A. - 
B. -x3
C. 
D. x3
Answer: C
Mathematics
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Find the period of the function.y = 4 cos x
A. 
B. ?
C. 4
D. 2?
Mathematics
Solve the problem.A rectangular enclosure must have an area of at least 6300 square yards. If 320 yards of fencing is to be used, and the width cannot exceed the length, within what limits must the width of the enclosure lie?
A. 70 ? w ? 90 B. 0 ? w ? 70 C. 70 ? w ? 80 D. 80 ? w ? 90
Mathematics
Write the word phrase as an algebraic expression. Use x to represent the unknown number in the phrase.15 more than the product of 3 and the difference between a number and 3
A. 15 + 3(x + 3) B. 15 + 3x - 3 C. 15 + 3(x - 3) D. 15 - 3x + 3
Mathematics
Verify that the values of the variables listed are solutions of the system of equations.
x = 0, y = 5, z = 4
A. solution B. not a solution
Mathematics