Solve.Suppose that a polynomial function is used to model the data shown in the graph below.
Determine the degree of the polynomial function of best fit and the sign of the leading coefficient.
A. Degree 3; negative leading coefficient.
B. Degree 4; positive leading coefficient.
C. Degree 3; positive leading coefficient.
D. Degree 4; negative leading coefficient.
Answer: C
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Find the inverse, if it exists, for the matrix.
A. 
B. 
C. 
D. 
Solve the problem.The shape of a barbecue pit is like a parallelogram with height of 42 inches and a base of 18 inches. It costs $0.70 per square foot to fill the pit with charcoals. What is the total cost?
A. $529.2 B. $14.70 C. $44.10 D. $3.68
Find the value of the logarithm without using a calculator.log9
A. -3 B. -81 C. 81 D. 3
Solve the problem.Two separate tests are designed to measure a student's ability to solve problems. Several students are randomly selected to take both tests and the results are shown below. Find the equation of the least-squares regression line that models the data.
A. y ? 0.930 - 19.4x B. y ? 19.4 + 0.930x C. y ? -0.930 + 19.4x D. y ? -19.4 - 0.930x