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

What's the answer for 9p+q-6p-q=

Suppose you did a survey of male shoes size and the mean of that survey was size 10 with a standard deviation of 1.5. What is the z-score of a size of 7.5?

What is the sum of the first five terms of a geometric series with a1 = 10 and r = 1/5? Express your answer as an improper fraction in lowest terms without using spaces.

A Girl gets 2,000 gift toward a college education from her grandparents. How much will the 2,000 be worth in 17 years if it is invested at 7% and compounded quarterly

A group of hikers buy 8 bags of trail mix. Each bag contains 3 1/2 cups of trail mix. The trail mix is shared evenly among 12 hikers. How many cups of trail mix will each hiker receive? Each hiker will receive cups of trail mix.

What is the product of (8.8 * 10^6) (5 * 10^2) ?

Find the two positive numbers that satisfy the given requirements: "The sum is S and the product is a maximum."

Write an equation of the line that passes through (7,10) and is perpendicular to the line y=1/2x-9.

3 pounds of trill mix put into 8 bags equally what will each bag have

A plane travels 11,000 miles total. The plane travels at 45 miles per hour. How many hours, days, or both does it take to travel?