Answer:
y=-1/2x+7
Step-by-step explanation:
Function would be f(x) = 5x+85
here, x= 15
5(15)+85 = 75+85 = $160
Remember property of exponents

add exponents of same base
ok so
50,000 is 5 times 10^4
so
50000 times 10^15=
5 times 10^4 times 10^15=
5 times

=
5 times 10^19