What's an equivalent expression for 7 (2x + 9)

An equivalent expression means that we need an equation that is equal to the one you have listed

one way you can do this is to multiply the 7 by each term in the parentheses

this will give us 14x + 63

Here is how we check if these are equivalent. pick a number to replace "x" and then solve the problem. if we get the same answer from both expressions then we are correct

Im going to choose the number 1

7 (2 (1) + 9)

7 (2+9)

7 (11)

77

now replace "x" with the number 1 in our new expression and if we get 77 then they are equivalent

14x+63

14 (1) + 63

14+63

77

so 14x+63 is an equivalent expression