A submarine was diving at 77.1 feet per minute. Which number represents the position of the submarine in relation to the surface after 8 minutes?
A. -85.1 ft.
B. -616.8 ft.
C. 716.8 ft.
D. 85.1 ft.

First, Multiply 77.1 by 8 to find how many feet the submarine has dived.

77.1 × 8 = 616.8

Since the question is asking the submarines position "in relation to the surface," this number needs to be negated.

616.8 ⇒ -616.8

The submarine is at -616.80 ft in relation to the surface, so option B is correct.

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

3/20

step-by-step explanation:

well, there are 20 outcomes, and 3 of them you want. so, 3/20