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Firstly, find the values of x where f'(x) = 0

f'(x) = 6x² - 54

6x² - 54 = 0

6(x+3)(x-3) = 0

x = 3, y = -108 and x = -3, y =...

(1)x2 4a - 10b = 22(2)x5 15a + 10b = 35(1) + (2) 19a = 57a = 3sub a = 3 into (1)2(3) - 5b = 116 - 5b = 11-5b = 55b = -5b = -1

percentage profit = percentage increasepercentage increase = (difference/original) x 100                 = (50 - 40)/40) x100=25%

First of all, we need to get the equations in a form so that either x or y can be eliminated.

In this case, I have a positive amount of y, and a negative amount of y, meaning that I can a...

Percentages are always out of 100 - imagine the fraction 1/100. If I asked you to work out 1/100 of a number, how would you do it?It's pretty much the same for percentages - because 1% is the same as 1/10...