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

The answer is (a) 3 × x = y   and   (b) x + x + x = y.

Step-by-step explanation: Let 'x' and 'y' denote the number of hours that Tina practised last month and this month respectively.

Then, according to the given information, we have

x = 15   and   y = 45.

We can write the relation between 'x' and 'y' in two forms as follows -

(a) Multiplication form :   3 × 5 = 15  implies 3 × x = y.

(b) Addition form : 15 +15 +15 = 45  implies x + x + x = y.

Thus, the answers are (3 × x = y) and  (x + x + x = y).

c is the final : )