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Soloha48 [4]
3 years ago
15

The expression -x^2 + 70x -600 represents a companys profit for selling x items. For which number of items sold is the companys

profit equal to zero?
Mathematics
1 answer:
umka21 [38]3 years ago
7 0

Answer:

Step-by-step explanation:

-x² + 70x - 600

If we multiply all by -1, we have

x² - 70x + 600

If we factorise this, we have

x² - 10x - 60x + 600

x(x - 10) - 60(x - 10)

(x - 10) (x - 60)

x = 10

x = 60

If the company sells 10, or 60 items, their profit is 0

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Answer:

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Step-by-step explanation:

Given the 2 equations

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Adding the 2 equations term by term eliminates the y- term, that is

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Step-by-step explanation:

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julia-pushkina [17]
<h2>Answer:  a = ¹/₂ (4 + b)</h2>

<h3>Step-by-step explanation:</h3>

To solve for 'a' we have to make it the subject of the equation. Since there are two unknowns ('a' & 'b'), we won't get a numerical value of 'a', but an expression in terms of the second unknown 'b'.

Since 2a - b = 4                    <em> [add 'b' to both sides]</em>

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