If i got 12 baseball cards on monday 24 on tuesday and gave some to my brother and had 13 baseball cards left, how many did i give to my brother?

Easy points boii. read it. ya. fresh

An equation where variables are used to represent known values—function notation true or false

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.