91Ó°ÊÓ

Write an equivalent expression without using grouping symbols. $$ -(4 a-3 b+7 c) $$

Write an equivalent expression without using grouping symbols. $$ -[5 x-2 y-3 z] $$

Explain how the distributive, commutative, and associative laws can be used to show that \(2(3 x+4 y)\) is equivalent to \(6 x+8 y\)

List in order from least to greatest. $$\frac{4}{5}, \frac{4}{3}, \frac{4}{8}, \frac{4}{6}, \frac{4}{9}, \frac{4}{2},-\frac{4}{3}$$

To find the difference between a and b, we subtract b from a. Subtract 19 from \(-7\)

Is subtraction commutative? Why or why not?

Write a true sentence using either \(<,>,\) or \(=\). $$|-8| \square|8|$$

Simplify. $$ 2 x-7 x-(4 x-6) $$

Perform the indicated operation and, if possible, simplify. If a quotient is undefined, state this. $$ \left(\frac{-9}{5}\right)\left(\frac{5}{-9}\right) $$

Simplify. $$ 2 a+5 a-(6 a+8) $$