What is the inverse operation of division? how do you "undo" division?

a: multiplication

b: division

c: addition

d: subtraction

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given

Paul can type 60 words per minute and jennifer can type 80 words per minutes. how does paul's typing speed compare to jennifer's

Shirley spelled 12 of her 15 spelling words correctly on the test. what percentage did shirley get on the test?