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madreJ [45]
2 years ago
14

Is it always true that multiplying a negative factor by a positive factor results in a negative? If yes, provide an example. If

no provide a counter-example. PLEASE ANSWER!
Mathematics
2 answers:
vredina [299]2 years ago
8 0

Answer:

yes

Step-by-step explanation:

-5x5= -25

-1x4= -4

9x-9= -81

no counter example except if u count -2x0=0

Fed [463]2 years ago
3 0

Answer:

yes because -3x4 would be negative 3 four times, reseulting in a negative number

Step-by-step explanation:

hope this helped

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A rectangular box is designed to have a square base and an open top. The volume is to be 500in.3 What is the minimum surface are
mr_godi [17]

The minimum surface area that such a box can have is 380 square

<h3>How to determine the minimum surface area such a box can have?</h3>

Represent the base length with x and the bwith h.

So, the volume is

V = x^2h

This gives

x^2h = 500

Make h the subject

h = 500/x^2

The surface area is

S = 2(x^2 + 2xh)

Expand

S = 2x^2 + 4xh

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Evaluate

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Differentiate

S' = 4x - 2000/x^2

Set the equation to 0

4x - 2000/x^2 = 0

Multiply through by x^2

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Divide by 4

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Take the cube root

x = 7.94

Substitute x = 7.94 in S = 2x^2 + 2000/x

S = 2 * 7.94^2 + 2000/7.94

Evaluate

S = 380

Hence, the minimum surface area that such a box can have is 380 square

Read more about surface area at

brainly.com/question/76387

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5 0
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