45 is 20% of what number?

What is the value of the expression below? 148+(-6)| + |– 35= 7|

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1

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?