The answer is 4 if I am correct
Suppose in 1992 Chris was x years old, his brother was then 2x years old.
6 years later in 1998, Chris is (x+6) years old, his brother is (2x+6),
(x+6)=(2/3)(2x+6)
x+6=(4/3)x+4
(4/3)x-x=6-4
(1/3)x=3
x=6
in 1992, Chris was 6, so in 2018 he will be 6+(2018-1992)=32 years old.
9/10
3/5 *2/2 +6/10
9/10-6/10=3/10 or .3
Find slope: (y2-y1)/(x2-x1)
(3-4)/(-1-2) = -1/-3 = 1/3
Y = 1/3x + b
4 = 1/3(2) + b
4 = 2/3 + b, b = 10/3
Y = 1/3x + 10/3