91Ó°ÊÓ

In Exercises \(47-76\), perform the indicated division or state that the expression is undefined. $$\frac{-90}{-3}$$

In Exercises \(47-76\), perform the indicated division or state that the expression is undefined. $$-15 \div 3$$

Simplify each algebraic expression. $$7 x+(-5 y)+(-9 x)+19 y$$

Perform the indicated operation. Where possible, reduce the answer to its lowest terms. $$3 \div \frac{12}{7}$$

Determine whether the given number is a solution of the equation. $$3(w+2)=4(w-3) ; 10$$

Simplify each series of additions and subtractions. $$-6-(-3)+8-11$$

Simplify each series of additions and subtractions. $$-823-146-50-(-832)$$

Solve by writing a sum of signed numbers and adding. The greatest temperature variation recorded in a day is 100 degrees in Browning, Montana, on January \(23,1916\). The low temperature was \(-56^{\circ} \mathrm{F}\). What was the high temperature?

Simplify each algebraic expression. $$2 a+5-9 a$$

What are equivalent algebraic expressions?