Twice a number decreased by seven is equal to 43

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

What is the square root of 45? (step by step working plz)

What is 32+4 x (16 x 1/2) -2 show your work}