Which sentence does not belong with the other 3?

A.) x + 12 = 12 + x

B.) 7h = h ∙ 7

C.) 1 + a = a + 1

D.) n : 2 = 2 : n

The price of a laptop went down by $175. The new price is $950. Which of the expressions shows the price of the laptop before the sale?

Simplify 3/4 - 1 1/4

The side of a rectangle are in the ratio 3:2. What is the length of each side of the perimeter of the rectangle is 55 cm?

When p is divided by 12, the quotient is q with a remainder of 5, where p and q are positive integers. what is the remainder when p is divided by 6?

2.087 greater or less than 2.15

There are 36 people in newtown hiking club. 2/3 of the club must vote yes if the club is to hike the northern trail. 20 people have voted yes. how many more yes votes are needed?

One revolution of a 40 cm diameter ball compared to a 20 centimeter diameter ball is: A. 2 times as great. B. 4 times as great. C. The same D. 1/2 times as great.

Complete the equation of the line through (2,-2) and (4,1). Use exact numbers.

The distance between two towns is 15 miles. There are 20 distance markers evenly spread throughout the road between the towns. Jessie drove 45 of the distance when she was forced to stop because she ran out of gas.

A parking space shaped like a parallelogram has a base of 18 feet and a height is 7 feet. A car parked in the space is 15 feet long and 5 feet wide. How much of the parking space is not covered by the car?