Question

Let n equal a certain number. If five times the sum of the number and -1 is equal to 15 less than the product of 3 and the number, what is n?

Solve A=P+PRT "for" P

Answer 1

`5(n+(-1))=3n-15\\ 5(n-1)=3n-15\\ 5n-5=3n-15\\ 5n-3n=-15+5\\ 2n=-10\\ n=-5\\\\ A=P+PRT\\ A=P(1+RT)\\ P=(A)/(1+RT)`