Help ASAP explain please

Tina practice piano for 15 hours last month and 45 hours this month use multiplication to write a statement comparing me i was tina practice during the two months use addition to write a statement comparing the hours tina practice during the two months

Answer pls man im trying to get out of summer school

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me