What is the variable in the expression, 12x+7-13x+4?

A study of fish is being conducted in a pond. They marked 30 fish and released them. The next day, they counted 75 fish, 25 of them which had been marked. Find the best estimate of fish population in he pond.

write the following sentence as an equation: x is directly proportional to y and is inversely proportional to the cube of z.

The heights of children 2 years old are normally distributed with a mean of 32 inches and a standard deviation of 1.5 inches. pediatricians regularly measure the heights of toddlers to determine whether there is a problem.

Write two expressions that are equivalent to the expression listed below. (X^1/3) ^2

If 38 plants grew in 100 sq ft how many grew per sq ft

How do I find the sum or product of93 + (68+7) ?

2 1/4 simplified with 1/4

Kiyo used wire fencing to from a border around a circlular region was 5yards, what was the total length of border, rounded to the nearest tenth of a yard

How many different values can an algebraic expression like 5 + (x+2) 2 have?

What is equivalent to 6 (-5q+1)