What is the range of the following data set?

13, 17, 18, 15, 12, 21, 10

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Jonah goes to the store to buy three notebooks and four pencils. his total is $8.50. if the cost of one notebook is ten times the cost of one pencil, write and solve an algebraic equation to determine the cost of one notebook and pencil.

Simplify the fraction 45xy/15x^2 to lowest terms.

a teacher has 64 students to divide into small groups greater than 2 with no remaimder. how many ways can this be done?

How do I find if the graph is a function in pre-algebra

Find the solution to the system of equations. -2x+2y=-4 3x+3y=-18

What is the area of 10 3/4 • 12 1/2?

A rectangular sofa cushion is 36 inches by 30 inches by 20 inches. How many cushions can be covered with 38400 square inches of material?

How do you determine if a given set of measurements works for the side lengths of a triangle? (It should be a number)

If cosx = sin20, find the value of x, 0 Solve for x correct to the nearest minute given sin^2 x-3sin xcosx+2cos^2 x=0, where 0≤x≤180