First multiply each term by 24(the common denominator found by 8×3) to remove the fractions and make things easier.

This will give you,

Then just continue to simplify and isolate the variable.



D=rt for t
÷r both sides
d/r=t
A
Answer:
x=17/13
Step-by-step explanation:
-3(3x-3)=4/5(5x-10)
-9x+9=4x-8
-13x= -17
x=17/13
Cost = .10 x ( n ) + 50
= .10(400) + 50
= 40 + 50
= 90
I hope this helps.