Ineed to show my work so be descriptive, !

see explanation

Step-by-step explanation:

Using the proportionality theorem

(a)

= ( cross- multiply )

8(3x - 5) = 200 ← distribute left side

24x - 40 = 200 ( add 40 to both sides )

24x = 240 ( divide both sides by 24 )

x = 10

(b)

3x - 5 = (3 × 10) - 5 = 30 - 5 = 25

Hence

Perimeter = 10 + 25 + 28 + 16 = 79

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.