Write the system as a matrix equation of the form AX = B. 6x1 + 4x2 = 30 8x2 = 72
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Answer: C
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Find the exact function value.sin-1
A. 
B. - 
C. - 
D. 
Solve the problem.An electrician charges a fee of $45 plus $30 per hour. Let y be the cost in dollars of using the electrician for x hours. Find the slope-intercept form of the equation.
A. y = 45x + 30 B. y = 30x - 45 C. y = 45x - 30 D. y = 30x + 45
Approximate the area under the curve and above the x-axis using n rectangles. Let the height of each rectangle be given by the value of the function at the right side of the rectangle.f(x) = 2x2 + x + 3 from x = -2 to x = 1; n = 3
A. 17 B. 21 C. 25 D. 13
Write fraction in lowest terms.A marketing firm develops two different television commercials for a product. To determine which is more effective, the firm conducts an experiment. They randomly select 400 people using the phone directory and pay 200 to watch one of the commercials and the other 200 to watch the other. They then ask the viewers whether they would buy the product. 42 said yes in the first group, while 80 said yes in the second group. Write the lowest-terms fraction for each group.
A. 
, 
B. 
, 
C. 
, 
D. 
, 