Read the word problem. A parking garage charges 3 dollars for each of the first three hours. After three hours, the charge is 7 dollars per hour. What is the total cost for five hours of parking? Which strategy would help solve this word problem?
Answer
A
Write the equation open paren 5 times 3 dollars close paren minus open paren 3 times 7 dollars close paren is equal to total cost of five hours .
B
Write the equation open paren 3 times 3 dollars close paren plus open paren 2 times 7 dollars close paren is equal to total cost of five hours .
C
Write the equation open paren 3 times 3 dollars close paren plus open paren 5 times 7 dollars close paren is equal to total cost of five hours .
D
Write the equation open paren 3 times 3 dollars close paren times open paren 5 times 7 dollars close paren is equal to total cost of five hours .
Explanation
The first three hours cost 3 dollars per hour, so that part costs 3 × 3 = 9 dollars. The remaining 2 hours cost 7 dollars per hour, adding 2 × 7 = 14 dollars. The equation is (3 × 3 dollars) + (2 × 7 dollars), which totals 23 dollars; this is choice B.
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