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3 years ago

7

The local hardware store wants to increase their inventory. last year 15 electric screwdrivers cost them $300. at the same cost,

how much would 45 screwdrivers cost them this year?

1 answer:

VMariaS [17]3 years ago

3 0

Answer:

Cost of 45 screwdrivers will be = $900

Step-by-step explanation:

Last year 15 electric screwdrivers cost to the local hardware store = $300

So per screwdriver cost = $\frac{\text{Total cost}}{\text{Total number of screw drivers}}$

= $\frac{300}{15}$

= $20

Now we have to calculate the cost of 45 screw drivers.

Since cost of 1 screwdriver = $20

So cost of 45 screwdrivers = 20×45 = $900

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Answer:

$x^2 + 15x - 60 = 0$

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Step-by-step explanation:

Given

Dimension:

$(x + 15)\ by\ x$

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Required

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Solving (a): Quadratic Equation.

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Open Bracket

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<em>Hence, the above represents the quadratic equation</em>

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First, we need to solve for x

This can be solved using quadratic formula:

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So:

$x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}$

$x = \frac{-15 \± \sqrt{15^2 - 4*1*-60}}{2*1}$

$x = \frac{-15 \± \sqrt{225 + 240}}{2}$

$x = \frac{-15 \± \sqrt{465}}{2}$

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$x = \frac{-15 + 21.56}{2}$ or $x = \frac{-15 - 21.56}{2}$

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$x = 3.28$

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$Length =3.28 +15$

$Length =18.28$

$Width = x$

$Width =3.28$

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