Answer:
r = 225 Mil/h speed of the airplane in still air
Step-by-step explanation:
Then:
d is traveled distance and r the speed of the airplane in still air
so the first equation is for a 4 hours trip
as d = v*t
d = 4 * ( r + 25) (1) the speed of tail wind (25 mil/h)
Second equation the trip back in 5 hours
d = 5 * ( r - 25 ) (2)
So we got a system of two equation and two unknown variables d and
r
We solve it by subtitution
from equation (1) d = 4r + 100
plugging in equation 2
4r + 100 = 5r - 125 ⇒ -r = -225 ⇒ r = 225 Mil/h
And distance is :
d = 4*r + 100 ⇒ d = 4 * ( 225) + 100
d = 900 + 100
d = 1000 miles
Answer:
I would say " zero" to. Sorry if it's wrong
The answer to the question is b
$9 each hour she works + 7.50 fee
$7.50+$9h= $34.50
Answer:
1/3
Step-by-step explanation:
2nd one
Answer:
(8 x 9) x (2 x 5) is the correct answer.
Step-by-step explanation:
(8 x 9)= 72
(2 x 5)= 10
72 x 10 = 720
