Find the weighted mean of the numbers in the table. Round to the nearest tenth.A class of 44 students took a 10-point quiz. The frequency of scores is given in the table. 
A. 7.6 points
B. 7.5 points
C. 7.8 points
D. 7.3 points
Answer: C
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?In a scale drawing, 1/4" represents 10 miles. Which of the following is true?
A. ?An inch represents 20 miles. B. 6 miles is represented by 1/8". C. 3 miles is represented by 1/16" D. ?4 miles is represented by 1/10" E. ?5 miles is represented by 1/6".
Find all the first order partial derivatives for the following function.f(x, y) = (9x4y3 + 2)2
A. 
= 72x3y3(9x4y3 + 2); 
= 54x4y2(9x4y3 + 2)
B. 
= 36x3y3; 
= 27x4y2
C. 
= 54x4y2(9x4y3 + 2); 
= 72x3y3(9x4y3 + 2)
D. 
= 2(9x4y3 + 2); 
= 2(9x4y3 + 2)
Graph the function.y = 2 cos 4?x
A. 
B. 
C. 
D. 
Solve the problem.A domed ceiling is a parabolic surface. For the best lighting on the floor, a light source is to be placed at the focus of the surface. If 5 m down from the top of the dome the ceiling is 4 m wide, find the best location for the light source.
A. 0.6 m down from the top B. 0.8 m down from the top C. 0.4 m down from the top D. 0.2 m down from the top