Which of the following statements about a variable are true?

A variable cannot be subtracted.

A variable is represented by a letter.

A variable represents a quantity.

A variable cannot be multiplied.

A soup recipe calls for 2 pounds of rice for 25 servings. How many pounds are needed for 30 servings?

X-c/2=d for x ...

The sixth graders have a math test and science test today. They have a science test every 9 schools days and a math test every 6 school days. In how many days will tests fall on the same day again?

Choose all the expressions that are equal to 0.8

If triangle QRS is congruent to triangle XYZ, what are 2 pairs of congruent sides and 2 pairs of congruent angles?

Solve for x. s=3w+2x

Andre wants to save $40 to buy a gift for his dad. Andre's neighbor will pay him weekly to mow the lawn, but Andre always gives a $2 donation to the food bank in weeks when he earns money.

The sum of consecutive integers 1,2,3, ..., n is given by the formula 1/2n (n+1). How many consecutive integers, starting with 1, must be added to get the sum of 1081

Two lines that intersect to form right angles are called what? A. Skew lines B. Line segments C. Perpendicular lines D. Parallel lines

In the United States, the number y (in millions) of bicycles sold with wheel sizes of 20 in. or greater can be modeled by the equation y = 0.3x + 15, where x is the number of years since 1981. In what year were about 22 million bicycles sold?