DEF is a isosceles right triangle, so DE =EF. apply Pythagoras:
DF² = DE² + EF² , BUT DE = DF .then DB² = 2DE² = 28²
DE² = 28/2 = 14 and DE = √14 = 3.71 ≈3.7
For the first one it would be:
C(800)=600
The second would be:
C(200)=e
And the third would be:
C(s)=900
The basic exponential parent function in this question is A, so choose Option A
Factoring the equation gives P(x) = (x - 4)(x - 2)(x + 1)(x + 2).
The graph will begin at x = 0, where P(x) = 16, as this is the y-intercept of the function. From 0 <= x < 2, P(x) > 0. There are break-even points at x = 2 and x = 4, while between them, P(x) < 0. As x increases beyond x = 4, the profit P(x) increases greatly (up to infinity). The section of the graph below x = 0 is meaningless, as the company cannot produce a negative number of laptops.