Annie is 3 years older than James. (Use J represent James' age.)

a. Write an expression to represent Annie's Age.

b. If the sum of their ages is 18, write an equation to represent this situation

C. How old is Annie?

A) Annie = J+3

B) J + (J+3) = 18

C)

2J+3 = 18

-3 - 3

2J = 15

1/2 (2J) = (15) 1/2

J=7.5

18-7.5 = 10.5

Annie is 10.5

Step-by-step explanation:

James' age = J

a) Annie is 3 years older than James so,

Annies age = 3 + J

b) Sum of their ages is 18 so,

Annies age + James' age = 18

= 3 + J + J = 18

2J = 18-3

J = 15/2 = 7.5

c) Annies age = 3 + J = 3 + 7.5

= 10.5 years