The question is wrong since population is not counted in points . for question like these use formula :P(1+R/100)^t where p is current population,r is rate and t is time.
Question is vague.
to solve for x:
subtract 10 on both sides
y - 10 = 8x
isolate the x, so divide the coefficient
(y - 10)/8 = x
to solve for y:
y = 8x + 10
N+d=47
5n+10d=295
divide 2nd by 5
n+2d=59
we have
n+d=47
n+2d=59
eliminate n
multiply first equaton by -1 and add to other equaton
-n-d=-47
<u>n+2d=59 +</u>
0n+1d=12
d=12
sub back
n+d=47
n+12=47
minus 12 both sides
n=35
35 nickles
D is answer