Solve the problem.The mean height of 5 students is 56.4. If one of the students leaves, the mean height becomes 57.25. What is the height of the absent student?

A. 56
B. 50
C. 53
D. 54


Answer: C

Mathematics

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Use properties of exponents to simplify the expression. First, express the answer in exponential form. Then, evaluate the expression.23 ? 22

A. 25; 12 B. 5 ? 2; 10 C. 25; 32 D. 26; 64

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Use logarithmic differentiation to find the derivative of y.y = x(x - 3)(x - 9)

A. x(x - 3)(x - 9)
B. x(x - 3)(x - 9)(lnx + ln(x - 3) + ln(x - 9))
C. 1
D.  +  + 

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Solve the inequality.-3x2 + 7x - 5 ? 0

A.  ? x ? 5
B. -3 ? x ? - 
C. All real numbers
D. No solutions

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