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

1 Answer
thelittlestleafeon
Mar 5, 2018

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#.

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