15x+5y=30 with y by itself

2.5 (4k+2) = 12k solve for k

Subtract. Express your answer in simplest form. 9/10-2/3

12/100 in simplest form

There were n signers of the declaration of independence. the oldest was benjamin franklin, who was yy years old. 7 is 10% of yy and nn is 80% of yy. how many signers were there?

How Do I reduce 14/20

10 skeins of yarn will make 4 scarves. How many scarves can be made with 25 skeins of yarn?

The probability that a new spark plug is defective is 0.06. You need two new spark plugs. What is the probability that both spark plugs you buy are defective? A) 0.06 B) 0.12 C) 0.0036 D) 0.0030

Angie has a jar that contains 2 red marbles, 2 blue marbles, and no other marbles. She randomly draws 2 marbles from the jar. If the marbles are the same colour, she discards one and puts the other back into the jar.

Henry had charges 933 dollars to his credit card. Even after the cost of his net purchase, he was still under his credit limit of 1500 dollars. Write a mathematical sentence that expresses the information

On Tuesday a local hamburger shop sold a combined total of 264 hamburgers and cheeseburgers. The number of cheeseburgers old was two times the number of hamburger sold. How many hamburgers were sold?