Solve the problem.Bill swims at a speed of 6.7 mph in still water. The river he's in flows at a speed of 2.1 mph. How long will it take Bill to swim 2.7 mi upstream? Round your answer to the nearest tenth of an hour, if necessary.
A. 12.4 hr
B. 0.6 hr
C. 1.7 hr
D. 0.3 hr
Answer: B
You might also like to view...
Write the function in the form y = f(u) and u = g(x). Then find dy/dx as a function of x.y = 
9
A. y = u9; u = 6x2 - 
- x; 
= 9
8
B. y = u9; u = 6x2 - 
- x; 
= 9
8
C. y = u9; u = 6x2 - 
- x; 
= 9
8
D. y = 6u2 - 
- u; u = x9; 
= 12x18 - 
- x9
Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t, and k is a negative constant determined by the nature of the material. An artifact is discovered at a certain site. If it has 53% of the carbon-14 it originally contained, what is the approximate age of the artifact? (carbon-14 decays at the rate of 0.0125% annually.) (Round to the nearest year.)
A. 3760 yr B. 2206 yr C. 4240 yr D. 5079 yr
Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
A. 
B. 
C. 
D. 
Use a calculator to perform the indicated operation. Round the result to two decimal places.- 
A. 5.40 B. 0.19 C. -5.40 D. -0.19