Without graphing, find the line of symmetry.f(x) = -(x + 3)2 + 6
A. x = 4
B. x = 9
C. x = -3
D. x = 6
Answer: C
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Solve the problem.In a school survey, students showed these preferences for instructional materials. 
About how many students would you expect to prefer computers in a school of 700 students?
A. About 126 students B. About 36 students C. About 252 students D. About 140 students
Determine the value of the variable so that the equality is a proportion.
= 
A. 17.65 B. 8.825 C. 10.325 D. 0.041
Determine if the equation is an identity.sin 
= csc x
A. Yes B. No
Solve the problem.The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands). By using linear regression, the following function is obtained: 
where x is the cost of advertising (in thousands of dollars) and y is number of products sold (in thousands). Use this function to predict the number of products sold if the cost of advertising is $13,000.
A. 92.07 B. 36,325.8 C. 98.77 D. 89.07