Find the correlation coefficient.The test scores of 6 randomly picked students and the number of hours they prepared are as follows: 
A. -0.2241
B. -0.6781
C. 0.6039
D. 0.2015
Answer: C
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Simplify.(4b3 - 5b - 2) + (4b4 - 8b3 + b2 - 4b)
A. 4b4 - 4b3 + b2 - 9b - 2 B. 4b4 - 4b3 + b2 + 9b - 2 C. 4b4 - 12b3 + b2 + 9b - 2 D. 4b4 + 4b3 + b2 - 9b - 2
Find the inverse function of f. State the domain and range of f.f(x) = 
A. f-1(x) = 
; domain of f: {
x ? -5}; range of f: {
y ? - 3}
B. f-1(x) = 
; domain of f: {
x ? -5}; range of f: {
y ? 3}
C. f-1(x) = 
; domain of f: {
x ? -5}; range of f: {
y ? 5}
D. f-1(x) = 
; domain of f: {
x ? -5}; range of f: {
y ? 
}
Simplify the expression.10x2 + x + 4x2 + 2x
A. 14x2 + 3 B. 28x2 C. 14x2 + 3x D. 40x2 + 3x
Round the numbers so that there is only one non-zero digit, and estimate the answer. Then perform the indicated operation to find the exact answer.922.2 - 9.048
A. estimate: 891; exact: 913.152 B. estimate: 891; exact: 913.162 C. estimate: 991; exact: 923.152 D. estimate: 891; exact: 913.252