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. What is the bottom cutoff for an A grade? Round your answer to the nearest whole number.
A. 80
B. 90
C. 79
D. 82
Answer: D
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Perform the operation and write the result in the standard form.(6 - 7i) + (2 - 2i)
A. 8 - 9i B. 8 + 9i C. -8 - 9i D. 8 - 5i
Solve the problem.Find an equation of the line containing the centers of the two circles x2 + y2 + 8x - 2y + 16 = 0
and x2 + y2 + 2x + 6y + 6 = 0
A. -4x + 3y + 13 = 0 B. -2x + 5y + 13 = 0 C. 4x - 3y + 13 = 0 D. 4x + 3y + 13 = 0
A shipping crate has a square base with sides of length x feet, and it is half as tall as it is wide. If the material for the bottom and sides of the box costs $2.75 per square foot and the material for the top costs $1.00 per square foot, express the total cost (in dollars) of material for the box as a function of x. ?
A. 
B. 
C. ?
D. ?
E. 
Express as a single logarithm and, if possible, simplify.ln (x2 - 4) - ln (x + 2)
A. ln (x - 2) B. ln (x2 - 2) C. ln (x + 2) D. ln (x - 4)