Solve by using addition, subtraction, multiplication, or division as needed.Akira's car used 21 gallons of gasoline when he drove it 525 miles. How many miles per gallon did it get?
A. 25 miles per gallon
B. 21 miles per gallon
C. 53 miles per gallon
D. 504 miles per gallon
Answer: A
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Find the indicated rate.Kayla earned $4850 for 5 weeks of seasonal work. What was her unit rate in dollars per week?
A. $5/wk B. $100/wk C. $970/wk D. $4850/wk
First, use front end rounding to estimate each answer. Then find the exact answer.The plane was losing 13 feet in altitude per second. How many feet in altitude was the plane losing in 72 seconds?
A. estimate: 
? 72 = 
feet; exact: 
feet
B. estimate: 
? 70 = -700 feet; exact: -936 feet
C. estimate: 
? 72 = 
feet; exact: 
feet
D. estimate: 
? 70 = 
feet; exact: 
feet
Use the appropriate formula to answer the question.How long would it take to drive 1400 kilometers if your average speed was 100 kilometers per hour?
A. 15 hr B. 150 hr C. 1400 hr D. 14 hr
Solve the problem.The polynomial G(x) = -0.006x4 + 0.140x3 - 0.53x2 + 1.79x measures the concentration of a dye in the bloodstream x seconds after it is injected. Does the concentration increase between 10 and 11 seconds?
A. Yes B. No