Question

How do you evaluate `10.5-f` for `f=-3.2`?

Answer 1

13.7
Substitute in for f and solve:

Explanation:

In order to evaluate this, we first have to plug in the given value of f and then subtract the negative.
When we substitute in, we get `10.5-f=10.5-(-3.2).`
Subtracting a negative is the same as adding, so `10.5-(-3.2)` simplifies to `10.5+3.2`.
Now all that's left is to add the two numbers together. We add the decimal places together first (`5+3=7`), then we add the numbers out front (`10+3=13`), so `10.5+3.2=13.7`.