Question

Can someone help please

Answer 1

9(5 + 10)

9 is the greatest common factor of 45 and 90 (they can both be divided by 9)

check:
9 • 5 = 45
9 • 10 = 90
45 + 90

Answer 2

put 9(5+10) because 9 times 5 is 45 and 9 times 10 is 90