3x+2y=12 and 6x + 3y=21

The sialic continents, mafic ocean floors, the crust, the mantle and the core were all formed while the early melted Earth cooled and differentiated as low density minerals floated to the surface and heavy, denser minerals sank to the center.

The volume of a cube shape crate is 27 cube feet. what is the length of one edge of the crate.

If 100% equals 360 degrees then what does 56% equal to

Dan had 78 dollars to spend on 7 books. After buying them he had 15 dollars. How much did each book cost?

What is the probability of getting either a nine or an ace when drawing a single card from a deck of 52 cards?

A biker traveled 20 miles in 4 hours. A unit rate to describe this would be 5 miles per hour. What is another unit rate in this situation?

On Monday, a local hamburger shop sold a combined total of 504 hamburgers and cheeseburgers. The number of cheeseburgers sold was three times the number of hamburgers sold. How many hamburgers were sold on Monday?

How to subtract micro fractions

A rancher has 4000 ft. of fence for constructing a rectangular corral that is divided into 3 equal sections. one side of the corral will be bounded by his barn and needs no fencing.

The graph shows the relationship between the total cost and the number of erasers bought at the student store. Which statement is true?