Select all the numbers
that are rational.
4.215...
4.36
-18
pi
5

For what value of x does 4x = (1/8) x + 5?

How do i find the missing angle measure in a polygon

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?