### Home > AC > Chapter 2 > Lesson 2.1.3 > Problem 2-30

2-30.

Read the Math Notes box for this lesson. Then evaluate each expression below.

For

when, what doesequal?Rewrite the expression, substituting in the known variable.

For

when, what doesequal?See part (a) for a strategy to evaluate this expression. Remember to pay attention to negative signs.

For

when, what doesequal?Rewrite the expression, substituting in the known variable.

For

when, what doesequal?Refer to parts (a) and (c).

For

when , what doesequal?Rewrite the problem, substituting in the known variable and then rearrange the problem to make it equal to the unknown variable.