The easiest way is to try the point (-4,1), that is, x=-4, y=1,
to see which equation works.
b works.
The usual way to do it is to find the equation of the circle
standard form of a circle is (x-h)²+(y-k)²=r², (h,k) are the coordinates of the center, r is the radius.
in this case, the center is (-2,1), so (x+2)²+(y-1)²=r²
the given point (-4,1) is for you to find r: (-4+2)²+(1-1)²=r², r=2
so the equation is (x+2)²+(y-1)²=2²
expand it: x²+4x+4+y²-2y+1=4
x²+y²+4x-2y+1=0, which is answer b.
Wait it says ur in high school so u can't be over 30. that isn't possible. So what's the problem here? not good at math.
Answer:
a
The null hypothesis is 
The alternative hypothesis is 
b

c

d
The decision rule is
Reject the null hypothesis
e
There is sufficient evidence to support the researchers claim
Step-by-step explanation:
From the question we are told that
The first sample size is 
The sample variance for elementary school is 
The second sample size is 
The sample variance for the secondary school is 
The significance level is 
The null hypothesis is 
The alternative hypothesis is 
Generally from the F statistics table the critical value of
at first and second degree of freedom
and
is

Generally the test statistics is mathematically represented as

=> 
=> 
Generally from the value obtained we see that
Hence
The decision rule is
Reject the null hypothesis
The conclusion is
There is sufficient evidence to support the researchers claim
Answer:
$32.00
Step-by-step explanation:
$70 X .35 = $24.50 sneaker discount
$30 X .25 = $7.50 shirt discount
$24.50 + $7.50 = $32.00
Answer:
7920 yards
Step-by-step explanation:
just use a calculator next time. Do miles to yards converter in :)