Question

please solve these questions ques.14, 15 ,18, 19

Answer 1

perimeter = a+b+c
if sides of the triangle is a,b,c
let b=17/6 according to question
and a=c
a+b+c=43/4
2a+17/6=43/4
2a=43/4-17/6
2a=129-34/12
2a=95/12
a=95/24

Answer 2

18.
$( \frac{5}{7} ) {}^{ - 14} = ( \frac{5}{7} ) {}^{7x} \\ 7x = - 14 \\ x = \frac{ - 14}{7} \\ x = - 2$