Question

A set of numbers is shown below:

{1.8, 3.8, 5.4, 8.4, 13.2}

The number __ from the set will make the equation x + 4 = 7.8 true.

Answer 1

All we need to do in solve for x in the given equation
x+4=7.8
x=3.8 (subtract 4 from both sides)

Therefore, the only value that will make the equation true is 3.8

Hope this helps