91Ó°ÊÓ

Simplify the expression.$−2(2m−1)+4m$

Solve the equation. Check your solution.

$x+8.5=13.7$

Solve the equation using mental math.

$11-p=19$

Solve the equation. Check your solution.

$216=u-129$

Solve the equation using mental math.

$-2=r-7$

Simplify the expression.$8n−(n−3)$

Evaluate the expression using the distributive property and mental math.

$2  (1.99 )$

Drilling One type of thermal ice drill can drill through ice at a rate of 15 feet per minute by using heat to melt the ice. Find the time it takes the drill to melt through a sheet of ice 75 feet thick.

Simplify the expression.

25. $3+j+(- 9)$

Simplify the expression.

$9t-3\left(3t-2\right)$