Solve the problem.Scores on a test are approximately normally distributed with a mean of 70 and a standard deviation of 9. The teacher wants to give A's to the top 10% of students, B's to the next 25%, C's to the next 40%, D's to the next 16%, and F's to the bottom 9%. What is the bottom cutoff for a D grade? Round your answer to the nearest whole number.
A. 56
B. 58
C. 62
D. 65
Answer: B
Mathematics
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Mathematics
Simplify the exponential expression. Write any negative exponents as positive exponents. Assume all variables represent positive real numbers.(16x8y4)1/2
A. 4x4y2 B. 4x8y2 C. x4y2 D. 4x4y
Mathematics
The function Y2 is defined as Y1 + k for some real number k. Based upon the given information about Y1 and Y2, find k. 
A. 12 B. -25 C. 28 D. -15
Mathematics
Graph the line through the given point with the given slope.(-5, -6), m = 2
A. 
B. 
C. 
D. 
Mathematics