Use front-end rounding to round each number. Then, add or subtract the rounded numbers to get an estimated answer. Finally, find the exact answer.estimate exact
A. Estimate: 13,000; exact: 13,275.44
B. Estimate: 12,000; exact: 12,275.44
C. Estimate: 13,000; exact: 13,375.44
D. Estimate: 12,000; exact: 12,375.44
Answer: C
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Use scientific notation to perform the following operations. Leave your answer in scientific notation.(5 × 109) - (3 × 108)
A. 4.7 × 109 B. 4.7 × 108 C. 2 × 109 D. 2 × 101
Solve the problem.During a period of much rain, the water level in a river rose 2 inches each day for 2 straight days. How much higher was the river at the end of this period?
A. -4 inches B. -2 inches C. 2 inches D. 4 inches
Solve the problem.The school bake sale sold a total of 26 plates of brownies and slices of cake and collected a total of $102.50 for the sales. They sold 12 more plates of brownies than slices of cake. How many plates of brownies and slices of cake were sold?
A. 
plates of brownies and 
slices of cake
B. 7 plates of brownies and 19 slices of cake
C. 
plates of brownies and 
slices of cake
D. 19 plates of brownies and 7 slices of cake
Graph f by hand by first plotting points to determine the shape of the graph.f(x) = - 
x2
A. 
B. 
C. 
D. 