3.78 x 10^9 = 3780000000 = 3,780,000,000
3,780,000,000 / 14,000 = 270,000
270,000 = 2.7 x 10^5
125 minutes, or 2 hours and 5 minutes.

cross multiply
5*175=7x
875=7x

125=x
C(x) = 1200(40) + 100
or
= mx+c
where m = 1200, x = 40, y = 100
hope it helped,
click thx if it did.
2x+3x -9. You can simplify this to 5x-9.