Out of these numbers which ones are prime:

41, 71, 21, 61, 31, 91, 11, 81, 51

The 3 by 3 grid below shows nine 1 cm * 1 cm 1 cm*1 cm squares and uses 24 cm 24 cm of wire. What length of wire is required for a similar 20 by 20 grid?

What is the mixed number for 25/6

Which of the following equations is quadratic? a. x (x^2 + 1) = 0 b. 5 (4x + 2) = 3 c. (x + 3) (x + 4) = 5

If you have two drums and for flutes write each ratio as a fraction in simplest form

A store is having a sale on trail mix and jelly beans. For 5 pounds of trail mix and 6 pounds of jelly beans the total cost is $35. For 3 pounds of trail mix and 2 pounds of jelly beans the total cost is $15.

Suppose that you have a pattern rule with an algebraic expression. a) What does the constant term tell you about the pattern? b) What does the numerical coefficient tell you about the pattern?

Is the function f (x) = ( - 7) ^ x an exponential function? If so, identify the base. If not, why not?

What two numbers multiply to get - 294 and add to get 7

What is the common difference for this arithmetic sequence 45,40,35,30,25, ...

It takes 40 units of maple sap to produce one unit of maple syrup. Jane and her family are bottling maple syrup in 20 oz. bottles. She notices that they add about 2 oz. of air every time they fill a bottle, to avoid overfill.