Answer: 19.4
Step-by-step explanation:
Given
Profit is given in terms of the selling price

to get the maximum price, differentiate y w.r.t x

Put
to get maximum value

Thus, the company must sell it at 19.4
Answer:
(0, 1)
(-1, -1)
(1,3)
Step-by-step explanation:
Given the function;
y = 2x + 1
when x = 0
y = 2(0)+1
y = 1
Hence the required pair is (0, 1)
when x = -1
y = 2(-1) + 1
y = -2 + 1
y = -1
Hence the coordinate is (-1, -1)
when x = 1
y = 2(1) + 1
y = 2 + 1
y =3
Hence the coordinate is (1, 3)
You basically need to set up a porporion:
1.6/2.4 = x/7.2
x=4.8