Question

solve for c
7.85 - 2.15c = 20.75

Answer 1

7.85 - 2.15c = 20.75
7.85 - 7.85 - 2.15c = 20.75 - 7.85
2.15 = 12.4
c = 6 ?

Answer 2

two things wrong here.

Answer 3

First, you subtracted 7.85 from both sides - This is good!

but,
what is 20.75 - 7.85?

Answer 4

12.9

Answer 5

typed it wrong :s

Answer 6

good; your other problem is after that, you literally skipped a step.

Answer 7

so you are left with -2.15c = 12.9 after you subtract 7.85 from both sides.

Answer 8

what do you do now?

Answer 9

forgot the negative again. divide by - 2.15 on both sides

Answer 10

mmhmm, and what does this give you for an answer?

Answer 11

instead of 6, -6

Answer 12

yep yep, good job ;)