What is the value of x in the equation
x-? y=30, when y= 15?

Julia chooses a card at random from her set of cards. what is the probability that the card is labeled cat or hamster?

Kylie explained that (-4x+9)^2 will result in a difference of squares because (-4x+9)^2 (-4x+9)^2 =(-4x)^2+(9)^2=16x^2+81

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?