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Inessa05 [86]
2 years ago
7

Problem Page Maya purchased a prepaid phone card for $30 . Long distance calls cost 18 cents a minute using this card. Maya used

her card only once to make a long distance call. If the remaining credit on her card is $26.94 , how many minutes did her call last?

Mathematics
1 answer:
Helen [10]2 years ago
8 0
Her call lasted 17minutes

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3 0
3 years ago
A rectangular area is to be fenced in with 300 feet of chicken wire. find the maximum area that can be enclosed.
GarryVolchara [31]
Let the lengths of the sides of the rectangle be x and y. Then A(Area) = xy and 2(x+y)=300. You can use substitution to make one equation that gives A in terms of either x or y instead of both.

2(x+y) = 300
x+y = 150
y = 150-x

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The resulting equation is a quadratic equation that is concave down, so it has an absolute maximum. The x value of this maximum is going to be halfway between the zeroes of the function. The zeroes of the function can be found by setting A equal to 0:
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So the maximum area that can be enclosed is 5625 square feet.
6 0
3 years ago
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