Please help, no spam answers please, I will mark brainleist!

D.

Step-by-step explanation:

Its given that the rectangle has a perimeter of 60 units. A rectangle has four sides, and to get the perimeter, you add up all four sides. You are given one side is 20 units, and the other as 'x.'

So,

x + x + 20 + 20 = 60

2x + 40 = 60

Example for *wrong*

Letter C, x + 20 = 60, that would'nt equal 60 because youre only adding two sides instead of all four.

Hopefully this helps :)

step-by-step explanation: