Answer:
Graph it???
Step-by-step explanation:
f(4) = 3×4^2+15
4^2=16
3×16
48+15
63
f(4)=63
88.6
A=4(pi)r^2/3
D=9.2 : r=4.6
A=4(3.14)(4.6^2)/3=88.5898667
b