Algebra Application and Review

Which phrase best describes the expression  $5x\cdot6y\cdot10z$  ?

What is the value of $5x^2$  when x = 2.5?  Remember PEMDAS!

What is the value of ab - c when a = 3, b = 4, c = 5?

Which expression is equivalent to $\frac{1}{2}\left(10x\ -\ 8\right)$  ? 

A rectangle has a base (length) of 5x + 2 and a height (width) of 2x - 3. What is the perimeter of the rectangle?

What value from the set {12, 24, 36, 48} will make $\frac{x}{3}=12$  true? 

A square has a base of x units. Which expression could help you find the perimeter of the square?

Which equation is true when $x\ =\ \frac{1}{2}$  ?

What is the value of x in the equation $5.5x\ =\ 137.5$  ?

(Use a calculator!)