Solve.A commuter travels to work, driving a distance d at speed r. At the end of the day, she returns home and drives the same distance 4 mph faster, at a speed r + 4. Her average speed for the round trip can be represented by the expression 
Simplify this expression.
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Express the number in scientific notation.0.0000004
A. 4 × 10-6 B. 4 × 10-8 C. 4 × 10-7 D. 4 × 10-9
Mathematics
Simplify the rational expression. If the expression is already in simplest form, state this as your answer.
A. 
B. 
C. simplest form
D. 
Mathematics
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.What is 7.17 less 1.711?
A. Estimate: 5; exact: 5.459 B. Estimate: 6; exact: 6.459 C. Estimate: 5; exact: 5.469 D. Estimate: 6; exact: 6.469
Mathematics
Factor out the greatest common factor.11m2 - 20r3
A. no common factor (except 1) B. m2(11 - 20m) C. 3(3m2 - 6r3) D. 2(5m2 + 10r3)
Mathematics