8th Grade Expressions & Equations

Write an expression for the operation described below.

b more than a

• a + b

• a - b

• b - a

• ab

Which expression is correct for the sequence of operations described below.

triple the difference of b and a, then raise the result to the 10th power

Combine like terms.

q + q + 5 + q + q + q + 7

(a)  

There are y yellow dogs out of a total of 12 dogs at obedience class. Write an expression that shows the number of dogs that are not yellow.

• y - 12

• 12 - y

• 12 + y

• 12y

Evaluate the expression for k = –1.

Write your answer as a decimal or whole number.

–42.7k² − 25.5k − 14 − 2.8k

(a)  

Evaluate the expression for w = 2, x = –3.1, and y = 6.

Write your answer as a decimal or whole number.

w²y − x + 21 =

(a)  

Evaluate the expression for s = –3 and t = –86.

–2|s| + t =

(a)  

• There are only three terms

• There are four terms

• The coefficient of the first term is 4

• The coefficient of the first term is -4

• The coefficient of the third term is 1