The answer for number 4 is 13 and number 6 is 121 and the last problem for number 7 is 112
Answer:
Step-by-step explanation:
Given

comparing it with standard equation 
so 4a=1

so Focus of parabola is (0,0)
directrix
y=-a
here 
Subtract 89 from -42. k=-131
The formula of an area of a circle:

We have
r = 1.8 m
π ≈ 3.14
Substitute:

Answer c
Step-by-step explanation:
they have to be equivalent