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jekas [21]
4 years ago
13

How to find two numbers that sum equal 15 and product are maximized?

Mathematics
1 answer:
Tema [17]4 years ago
5 0
X - the first number15 - x - the second numberx(15 - x) - the product of the our numbers 
f(x) = -x^2 + 15x

The maximum value is in the vertex of parabola (h; k).
For ax² + bx + c:
h=\dfrac{-b}{2a};\ k=f(h)=\dfrac{b^2+4ac}{4a}
We have: a = -1; b = 15; c = 0
substitute:
h=\dfrac{-15}{2\cdot(-1)}=\dfrac{15}{2}=7.5
15 - 7.5 = 7.5
Answer: 7.5 and 7.5.

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Answer:

Let the truck is driven X miles per day

Charges of company A will be = 90+0.4X

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Let us find out value of X when charges of both companies are same

which means that   90+0.4 X= 30+0.7X

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The charges of both companies will be same if truck is driven 200 miles per day

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Step-by-step explanation:

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