A motorboat has a four hour supply of gasoline. How far from the marina can it travel if the rate going out against the current is 20mi/h and the rate coming back with the current is 30 mi/h

The distance the marina can travel = = 48 miles

Step-by-step explanation:

The rate going out against the current is = u - v = 20

The rate going out with the current is = u + v = 30

Let the distance traveled by the motorboat =

Total time the boat can travel = 4 hours

⇒ Total time = ( Time taken by boat to go against the current ) + ( Time                                  taken by boat to go  with the current )

⇒ 4 =

⇒ 4 =

⇒ 4 =

⇒ = 48 miles

This is the distance the marina can travel.

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb

$5.41

step-by-step explanation:

$20 - $14.51 = $5.49.