42.51 is the right answer
Based on the given table, you can notice that the rate of change of the number of pages read related to the number of hours, is 120 pages each 3 hours.
Then, to determine the number of pages read for 15 hours, consider that after 12 hours Sarah read 480 pages. After 3 more hours, that is, for 15 hours of reading, Sarah read 120 pages more, that is, she read 480+120=600 pages.
Hence, the answer is 600
Two of the given points have the same y-value. The midpoint of those two will be on the line of symmetry, as is the vertex. The x-value there is (-1+5)/2 = 2.
The general or standard form of a parabola is
(y-k) = a(x+h)^2
h,k are the intersection points of parabola
Intersection points are where y= 0, or x=0
itsnorigin at (,0,0)that means h=0, k=0
it passes through points (-1,2) and (1,2)
So then
y= ax^2 , 2 = a (-1)^2
this means a= 2
Then results standard form equation
Y = 2• X^2
Surface area = 2(6*3) + 2(6*2) + 2*(2*3) = 36+24+12 = 72 cm^2
