For question 1
a) y=1.601
b) area=1.81
For question 2
a) 28-28=0
b) (2x-1)(x-2)
For question 3
a) 64, 576x, 2160x^2
b) (1+x/2)(64) (1+x/2)(576x) (1+x/2)(2160x^2
For question 4
a) not sure
For question 5
x=1
x=1.63
For question 6
a) area of sector 17.5
b) angle= 0.8/9 not sure
c) 38.9cm^2
For question 7
c) N=44.1
a) sum to infinity 160
b) sum of 12= 127.77
For question 8
5root3
(x-11)^2 + (y-5root3)^2=sqrt4 not sure
For question 9
not sure
For question 10
a) surface area 2880 cm^2
b) >360 so minimum