Which expression is equivalent to twice the sum of x squared and four?

• $2x^2+4$

• $2\left(2x+4\right)$

• $2\left(x^2+4\right)$

• $2\left(x+4\right)^2$

Which expression is equivalent to three times a number less than twelve?

• $3n-12$

• $2\left(n-12\right)$

• $3\left(12-n\right)$

• $12-3n$

Which statement could be represented by the expression $n^2-6$ ?

• a number squared less than six

• a number squared less six

• the difference between six and a number squared

• the difference between twice a number and six

What is the value of $\frac{1}{2}\left(xy+y\right)z$ 

, when x=-2, y=4, and z=-5?

• 18

• 15

• 12

• 10

What is the value of this expression when x=  $\frac{1}{3}$  ?

 $x^2+9x-3$  

•  $\frac{20}{9}$  

•  $\frac{8}{3}$  

•  $\frac{1}{9}$  

•  $\frac{1}{6}$  

What is the value of this expression when a=64 and b=-3? $-3\sqrt{a}+b^3$  

• 3
  

• -3

• -33

• -51

The temperature of gas is -77ºF. What is the temperature of the gas in degrees Celsius?

 $F=\frac{9}{5}C+32$  

• -96ºC

• -60ºC

• -44ºC

• -25ºC

What is the value of $\frac{-2x^2y-8}{4\left(x+y\right)}$ if x=-4 and y=5? 

• 50

• 38

• -38

• -42

Write an algebraic expression for the following word phrase:

3 less than the quotient of 20 and x

 $-4s^2+t\div5$  

Evaluate the expression if s=2 and t=5. Write your solution in the box.