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3 years ago

13

Their Anywhere plan charges 20¢ per check whereas their Acu-checking plan costs $1.43per month plus 9¢ per check. For what nu

mber of checks per month will the Acu-checking plan cost less?

1 answer:

mote1985 [20]3 years ago

7 0

13 checks is where it is equal. 14 is where Acu-checking plan in cheaper

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Depends on the bag of Skittles you buy, but I assume you’re talking about a regular person 2.17 oz bag.

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3 years ago

The area of a room is 600 square feet. The length is (x + 5) feet and the width is (x + 4) feet. Find the dimensions of the room

tangare [24]

I'm going to assume that the room is a rectangle.

The area of a rectangle is A = lw, where l=length of the rectangle and w=width of the rectangle.

You're given that the length, l = (x+5)ft and the width, w = (x+4)ft. You're also told that the area, A = 600 sq. ft. Plug these values into the equation for the area of a rectangle and FOIL to multiply the two factors:
$A = lw\\
600 = (x+5)(x+4)\\
600 = x^{2} + 9x + 20
$

Now subtract 600 from both sides to get a quadratic equation that's equal to zero. That way you can factor the quadratic to find the roots/solutions of your equation. One of the solutions is the value of x that you would use to find the dimensions of the room:
$600 = x^{2} + 9x + 20\\
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(x + 29)(x - 20) = 0\\
x + 29 = 0, \:\: x - 20 = 0\\
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Now you know that x could be -29 or 20. For dimensions, the value of x must give you a positive value for length and width. That means x can only be 20. Plugging x=20 into your equations for the length and width, you get:
Length = x + 5 = 20 + 5 = 25 ft.
Width = x + 4 = 20 + 4 = 24 ft.

The dimensions of your room are 25ft (length) by 24ft (width).

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