5x + y = -2 -3x + 6y = -12 solve for both x and y using substitution.

Given that abcd is a rhombus, what is the value of x?

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

21 a stick 7 inches long is broken into two pieces, so that one piece is twice as long as the other one. how long are the two pieces?