Let d and m represent the daily and per-mile charges, respectively.
.. 3d +300m = 111.00 . . . . . . barney's charges
.. 5d +600m = 193.00 . . . . . mary's charges
You can double the first equation and subtract the second to find
.. d = 29
Then
.. m = (111 -3*29)/300 = 0.08
Best Rentals charges $29 per day and $0.08 per mile.
Let's find out!
-5 + x * x + 4.
-5 + x^2 + 4.
-5 + 4 + x^2.
-1 + x^2.
5 + x * x - 4.
5 + x^2 - 4.
5 - 4 + x^2.
1 + x^2
So, they are NOT the same, because one of the "1"'s are negative, and the other is positive.
The equation for a circle is (x-h)^2 +(y-k)^2=r^2
You just have to plug in your coordinates h is the x and k is the y.
The r is radius squared.
so, (x-2)^2+(y-(-5)^2=144
You have to be careful of those tricky negative values. When you distribute the y-(-5) it turns into y+5.
So your answer is D.
