Answer:
Step-by-step explanation:
area of a circle= (pi) x r^2
a= 3.14 x 7^2
a=3.14 x 49
a= 153.86 mi^2
Answer:
2,655 students
Step-by-step explanation:
The z-score for a 99% confidence interval is z = 2.576
The standard error for a proportion p is:

For a proportion of p =0.20, in order to ensure a standard error of 0.02, the sample size 'n' must be:

Rounding up to the next whole student, the sample size needed is 2,655 students.
Answer:
x = -48
<em><u>hopefully i helped :)</u></em>
If there are no repeating x values and an x value only goes to <em>one</em><em> </em>y value, then yes, it is a function.