Which expression is modeled by this arrangement of tiles?

30 - (-30)

30 - (-3)

30-3

30-30

A flying disc has a 12 3/4 inch radius. What is the approximate circumference, rounded to the nearest inch?

Four times Bruce's age plus two times Sarah's age equals 84. Bruce's age is also three times Sarah's age. how old is Bruce?

bob has a bag of marbles with 1 red, 1 blue, and one green. he has a dice numbered 1-6 what are all the possible combinations if he pulls 1 marble from the bag and rolls the dice

172,800 in scientific notation

A hummingbird lives in a nest that is 9 meters high in a tree. The hummingbird flies 15 meters to get from its nest to a flower on the ground. How far is the flower from the base of the tree?

Multiplying Fractions: 3/4 * 6/18 * 3/9

The Boyd corporation would like to donate 10 computers and 15 printers to local schools. The corporation would like to make sure that each school receives he same set of computers and printers with none left over.

If you have a cylinder with a diameter of 15 and height of 12 inches. What is the volume of the largest sphere that will fit inside os it?

Can√ (a²+b²) be written as √ (a+b) ?

Express the product of 2x2 + 6x - 8 and x + 3 in standard form.