Answer:
28x + 20
Explanation:
you just need to distribute
4(7x + 5)
you multiply 4 X 7x which would give you 28 and because 7 has a variable and 4 doesn't have a variable the x stays there so it would be 28x.
45, you need to multiply 4 x 5 which would give you 20, and because neither 4 or 5 have a variable it will stay 20
So now you just 28x with 20
28x + 20.