My teacher posted an answer sheet in preparation for a test coming up about factoring polynomials. One of the questions was... Completely factor the expression y^4-255. Step 1. (Y^2+16)(y^2-16). Step 2. (Y+4)(y-4)(y^2+16). I'm having trouble understanding why she didn't factor (y^2+16) in step 2 down further. I'm also having trouble with the positive and negative signs in this problem (when to use positive vs negative)

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,

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