Petri did the following problem but got the wrong answer. She needs to correct her mistake and turn the problem back in. (5 - 3) 2 ÷ 3 · 7 + 1 25 - 9 ÷ 3 · 7 + 1 25 - 3 · 7 + 1 25 - 21 + 1 4 + 1 5 What correction does Petri need to make? She needs to add before she multiplies. She needs to multiply 3 times 7 before she divides. She needs to change 25 to 10. She needs to subtract 5 - 3 first.