For the first one, are you simplifying?
1/4(7 + 3g) + -g/8
= (7+3g)/4 - g/8
= (14 + 6g)/8 - g/8
= (14 + 5g)/8
For the second, solve
2(x+2) = 3x - 17
For the third, let t=0 correspond with the year 2001
so C1 = .275t + 4.9
and C2 = .7t + 2.5
Now equate C1 and C2
.275t+4.9 = .7t+2.5
275t + 4900 = 700t + 2500
2400 = 425t
t = 5.6 yrs.
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