Solve the problem using a known formula.A contestant in a 21-mile race finished in 6 hours. What was her average rate during the race? (Round to the nearest tenth, if necessary.)
A. 0.3 mph
B. 126 mph
C. 3.5 mph
D. 15 mph
Answer: C
Mathematics
You might also like to view...
Solve the problem.Find the derivative of the function 
at the point 
in the direction in which the function increases most rapidly.
A. 
B. 
C. 
D. 
Mathematics
Solve the equation for the indicated variable.
= 5 for x
A. b - a + 5 B. 5a + b C. 5a + ab D. a + b + 5
Mathematics
Solve the problem.The intensity of a certain noise is 1.28 × 10-8 W/cm2. How loud, in decibels, is this sound level? Use the formula 
where 
(Round to the nearest decibel.)
A. 82 decibels B. 81 decibels C. -21 decibels D. 34 decibels
Mathematics
Perform the operations indicated. Write your answer in simplest form.1 - 8
A. -7 B. 7 C. 9 D. -9
Mathematics