Need help with these two..

>>192145
.

>>192145
Do you really not know how to solve this or are you just too lazy to work it out? it literally is just asking you to rearrange the equations so that you have n in one side and everything else on the other, in the first one, and b in one side and everything else on the other in the second one.

Do you not know how equations work? If so you probably need more help than what can be provided via imageboard.

>>192162
I don't know how to solve this.. i get the concept of isolating the variable but I don't know how to do that..

>>192165
Allright, I'll bite, I'll give you the solutions:
14) n=(A/P-1)/r

15)b=a/(ac-1)

>>192167
yeah but how did you get that?

>>192171
Allright, you're gonna make me type it all out in full detail? Fine.

14) A=P(1+nr) =>
A/P=1+nr =>
A/P-1=nr =>
(A/P-1)/r = n =>
n=(A/P-1)/r

15) (1/a) + (1/b) = c =>
(1/b) = c - (1/a) =>
1 =b(c -(1/a)) =>
b= 1/(c-(1/a)) = a/(ac-1)

>>192173
Thank you