Let 2_1/2 = 5/2.
Let t = time to fill 8 tires
(5/2)/8 = (5/2)/t
8(5/2) = (5/2)t
20 = (5/2)t
20 ÷ 5/2 = t
20 • 2/5 = t
8 seconds = t
Done.
Parameterize the surface (call it

) by

with

and

. Then the surface element is

The area of

is then given by the surface integral

Answer:
what is the rest of the qustion
Step-by-step explanation:
Answer:
What's the question lol ?
Step-by-step explanation:
To find a,construct a line that parallel to AB and DE cutting c, which you could refer to the photo((sorry for my terrible diagram ^^;;
from the photo,we can see that
a= <BCG + <GCE
<BCG=44° (alt.<, AB//FG)
<GCE=20° (alt<, FG//DE)
thus,a= 44°+20° =64°
hope it helps!