Evaluating expressions

On page 2 of homework handouts, you are asked to evaluate for b, assuming b = a number.

That simply means substitute the number given for b, and do the math.

So, if we have:

Evaluate the expression 3x when x=2,
that means that we will multiply 3 times 2.

If we have:
Evaluate the expression b-7 when b= 10,
that means we will subtract 7 from 10.

It sounds a little odd at first, but you get used to it.

Remember, multipication can sometimes look like a number next to a letter. For instance, 3b just means 3 times whatever "b" is.