I have a simple question about the algebra to do when we have to solve for a x amount in the formulas given.

For example in this two problems, we have to solve one for "C1"and the other one for "r".

How can I solve those two x values correctly to get the two results circled at the end?

please show me the steps! thank you!

30 Frasanings $1817, 298,80 = Cama (1 +0.0%) -1 how C1 = 18, 652.25 mouch she needs to coutum with auch t=47 FV 47 = PV (1+r) 4,880,000 - +50f4++)? r = 0 . 1812 r = 18 12% o