How to find the spread in math?

Bradley's shoe length is 17 cm long. Which list shows the dinosaur skeletons that were more than 320 centimeters long?

Mrs. Walsh is going to buy one lollipop for each student in her classes. Her class totals are 24 students, 21 students, 18 students and 23 students. If each bag of lollipops contains 20 lollipops how many bags will she need to buy?

What number multiplied by itself 3 times is 64

Anita has two sisters and three brothers. The mean of all their ages is 6 years. What will their mean age be 10 years from now? Twenty years from now?

Write 5 examples of things that can be represented by circles.

What is the y-intercept form of " (3,-2) and (-3,-12) ?"

A quadrilateral with 90 degree angles is shown. The lengths of the left and right sides are 10 and 2 y + 4. The lengths of the top and bottom sides are 18 and 10 + 2 x. What is the value of x?

2,653 rounded to the nearest hundred

the initial cost to drill a well is $21000. The daily rate to operate the well is $500. the current selling price is $65 per barrel of oil and the well is expected to produce 115 barrels per day. What would be the revenue for one day?

Elisa needs 40 shirts for a charity. One store is selling shirts for $6.95 each. Another store says that the total for al 40 shirts will be $325 with a 20% discount. Which store should Elisa buy shirts from? Shirts for $6.