x = 4/5 = 0.8
y = (4/x * x) + √x + 0.2 - 5x.
First, let's plug 0.8 in for x
y = (4/0.8 * 0.8) + √0.8 + 0.2 - 5(0.8)
(4/0.8 * 0.8) the 0.8s cancel out leaving just 4
y = 4 + √0.8 + 0.2 - 5(0.8)
5 * 0.8 = 4
y = 4 + √0.8 + 0.2 - 4
Add all the terms together
y = 1.09.
