Plz help giving brainlest plz due in 10 min will give extra points if u help

What are “like terms”? why can we only add like terms?

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

Acredit union pays 5% annual interest, compounded daily, on saving deposits. find the value after one year of $500 deposited in this account. a-$20.40 b-$25.64 c-$520.40 d-$525.64