Factor the polynomial by substitution.12z4 - 7z2 - 12
A. (3z2 + 4)(4z2 - 3)
B. (3z4 + 4)(4z - 3)
C. (4z2 + 3)(3z2 - 4)
D. (4z4 + 3)(3z - 4)
Answer: C
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Find Dxy.y = 7 tanh-1 (cos x)
A. - 
B. ln 
sin x
C. - 
D. - 
Provide an appropriate response.Let A = 
and let B = 
.Does the matrix A + B have an inverse?
A. Yes B. No
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 14.3 and 16.1 seconds
A. 34% B. 50% C. 48% D. 68%
Suppose 500 coins are tossed. Using the normal curve approximation to the binomial distribution, find the probability of the indicated results.251 heads or less
A. .552 B. .448 C. .536 D. .548