91Ó°ÊÓ

In Exercises 67 and 68, write and simplify expressions for (a) the perimeter and (b) the area of the rectangular sandboxes. \(4 x \mathrm{ft}\) $$ (x+5) \mathrm{ft} $$

In Exercises 69-72, translate the phrase into an algebraic expression. Let \(x\) represent the real number. $$ 23 \text { more than } x $$

Pens cost \(\$ 0.25\) each. Pencils cost \(\$ 0.10\) each. Write an algebraic expression that represents the total cost of buying \(p\) pens and \(n\) pencils.

You are driving 60 miles per hour on the highway. (a) Write an expression that represents the distance you travel in \(t\) hours. (b) How far will you travel in \(2.75\) hours?

In Exercises 89-96, evaluate the expression. $$ 6-10-(-12)+3 $$

In Exercises 89-96, evaluate the expression. $$ (-6)(-4) $$

In Exercises 97-102, evaluate the expression. $$ 0-(-12) $$