evaluate 4 - 0.25g + 0.5h when g = 10 and h = 5.

Explanation:

Step1: Substitute values of g and h

Substitute $g = 10$ and $h = 5$ into $4-0.25g + 0.5h$. We get $4-0.25\times10+0.5\times5$.

Step2: Calculate multiplications

First calculate the multiplications: $0.25\times10 = 2.5$ and $0.5\times5=2.5$. The expression becomes $4 - 2.5+2.5$.

Step3: Calculate subtractions and additions

$4-2.5 = 1.5$, then $1.5 + 2.5=4$.

Answer:

$4$