Answer:
she saved $5.25
Step-by-step explanation:
Let point (x, y) be any point on the graph, than the distance between (x, y) and the focus (3, 6) is sqrt((x - 3)^2 + (y - 6)^2) and the distance between (x, y) and the directrix, y = 4 is |y - 4|
Thus sqrt((x - 3)^2 + (y - 6)^2) = |y - 4|
(x - 3)^2 + (y - 6)^2 = (y - 4)^2
x^2 - 6x + 9 + y^2 - 12y + 36 = y^2 - 8y + 16
x^2 - 6x + 29 = -8y + 12y = 4y
(x - 3)^2 + 20 = 4y
y = 1/4(x - 3)^2 + 5
Required answer is f(x) = one fourth (x - 3)^2 + 5
Im not in this math section yet but i think that you can look it up as a worksheet and find the answer on google.
C) average of a data set
You add all of the data and divide by the number of data
136 °Fahrenheit
=
57.7778 °Celsius
If you rounded it, it would be 58 °Celsius.
