Find the average value of the function f over the given region.f(x, y) = 4x + 9y; R = {(x, y): 0 ? x ? 1, 0 ? y ? 1}
A. 
B. 
C. 13
D. 11
Answer: B
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Provide an appropriate response.Perform the multiplication: 3x3(7x2 + x - 3)
A. 21x5 + 3x4 - 3 B. 21x65 + 3x3 - 9x C. 21x5 + 3x4 - 9x3 D. 10x5 + 4x4
Translate to a system of two equations, then solve.Paul invested three times as much money in an account paying 5% interest than he did in an account paying 4% interest. If the total interest paid was $475, how much did he invest in each?
A. $7500 at 5%, $2500 at 4% B. $75 at 5%, $25 at 4% C. $7500 at 5%, $3000 at 4% D. $2500 at 5%, $7500 at 4%
Solve the problem. Find the magnitude of the torque in foot-pounds at point P for the following lever:
= 10 in. and 
= 10 lb
A. 100 ft-lb B. 4875.32 ft-lb C. -4875.32 ft-lb D. 975.06 ft-lb
At one high school, students can run the 100-yard dash in an average of 15.2 seconds with a standard deviation of .9 seconds. The times are very closely approximated by a normal curve. Find the percent of times that are indicated. Round to the nearest whole percent.Between 15.2 and 16.1 seconds
A. 14% B. 68% C. 34% D. 50%