This is what I got. Hope it helps
The answer should be this;
11.5(7) + 10.7 (8)= 166.1
166.1+ 85.6=251.7
Answer:
j = 2z + 1
jennifer is one year older or jennifer is plus one.
twice zacks age or two times zacks age.
jennifer's age is two times zacks age plus one or
j = 2z + 1