Refer to the figure. 
If m?1 PQ
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First, use front-end rounding to round each number and estimate the answer. Then, find the exact answer.Bob's grocery bill was $8.72. He gave the clerk a $20 bill. How much change should he receive?
A. Estimate: $11; exact: $10.28 B. Estimate: $9; exact: $8.72 C. Estimate: $11; exact: $11.28 D. Estimate: $11; exact: $11.27
Simplify. Assume that no radicands were formed by raising negative quantities to even powers.
A. 
B. 10
C. 
D. 
Write a cost function for the problem. Assume that the relationship is linear.An electrician charges a fee of $55 plus $40 per hour. Let C(x) be the cost in dollars of using the electrician for x hours.
A. C(x) = 55x - 40 B. C(x) = 55x + 40 C. C(x) = 40x - 55 D. C(x) = 40x + 55
Simplify the expression. Write the answer using positive exponents.(r-7t)-3
A. - r21 t3
B. r21t
C. - 
D. 