Question 97374
f(x)=3x-10 and g(x)=3x+7
(a) g(-1)         (b) f(1)-g(2)  

g(x)=3x+7
replace x by -1
g(-1)= 3*-1 + 7
     =-3+7
     = 4

now f(x) = 3x-10
    f(1) = 3*1 -10
         =3-7
         =-4
again,
   g(2)= 3*2 + 7
       =6 +7
       =13

f(1) - g(2)
= -4 -13   substituting the values of f(1) and g(2) from above
= -17