If you list the answer choices, I might be able to help you better.
I think the answer is 7.725 so sorry if I’m wrong but see if that answer is correct
Her estimate is lower than her actual cost because her total is 72.87 she is off by 1.72 because she only added 42,17,and 12 and forgot all about adding the cent or the .60,.38,and the .89.

The equivalent expression is ~

Let's evaluate f(b - 2) ~