Solve the problem.In the following formula, y is the minimum number of hours of studying required to attain a test score of x: y = 
. How many hours of study are needed to score 88? Round to the nearest hundredth of an hour.
A. 2.82 hr
B. 101.04 hr
C. 28.20 hr
D. 6.55 hr
Answer: A
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Solve the system of equations using Gaussian elimination or Gauss-Jordan elimination.-4x - 4y - 4z = -4-12x - 11y - 10z = -9-8x - 7y - 6z = -5
A. (-2, 6, 0) B. (-2, 3, 0) C. (z - 2, -2z + 3, z) D. No solution
Translate the problem to a system of equations and then solve.Mrs. Boyd has a desk full of quarters and nickels. If she has a total of 13 coins with a total face value of $1.85, how many of the coins are nickels?
A. 9 nickels B. 11 nickels C. 7 nickels D. 6 nickels
F(x) is the cumulative distribution function for a continuous random variable X. Find the probability density function f(x) associated with F(x).F(x) = 
A. f(x) = 
B. f(x) = 
C. f(x) = 
D. f(x) = 
Add.(2r2s2 + 3r2s - 7rs) + (7r2s2 - 2r2s + 7rs - 4)
A. 9r2s2 + 5r2s - 14rs - 4 B. 9r2s2 + 5r2s + 14rs + 4 C. 9r2s2 + r2s - 4 D. 9r2s2 + r2s - 14rs - 4