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aalyn [17]
3 years ago
13

NEED HELP WITH 13 a-b!!!! PLEASE HELP!!!!!!!

Mathematics
1 answer:
sergij07 [2.7K]3 years ago
8 0

Answer:

a - 6%

b - $7.50

Step-by-step explanation:

The answer for a

the only items that had sales tax were $3.00 and $0.50. The total tax for the both was $0.21 so you can find what percent 0.21 is of 3.00 + 0.50 o 3.50. Do this by dividing the percent you are looking for, 0.21, by what it is the percent of 3.50. 0.21 / 3.50 = 0.06. then you multiply the number you got, in this case 0.06 by 100 to find the percentage so it is 6%

The answer for b

Here you can just take the subtotal, $13.00, and subtract all the other prices and you will be left with the price of the top. 13.00 - 3.00 - 2.00 - 0.50 = 7.50. So the answer is $7.50

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Answer:

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Step-by-step explanation:

CP= x

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Of all rectangles with a perimeter of 1313​, which one has the maximum​ area? (give the​ dimensions.) let a be the area of the r
saw5 [17]

Let the length be l.

Formula of perimeter is P= 2(length +width )

1313 =2 (l+w)

l = \frac{1313}{2}-w

And the formula of area of rectangle = length times width .

A = l*w

A= (\frac{1313}{2}-w )*w

A = \frac{1313w}{2} -w^2

And that's the required objective function .

The equation represents parabola and a parabola is maximum at its vertex .

And the formula of vertex is

w = -\frac{b}{2a} =-\frac{1313}{4}

Substituting this value of w in the formula of area, we will get

A= \frac{1313*1313}{8} -(\frac{1313}{4})^2

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8 0
3 years ago
What’s the correct answer for this?
Dima020 [189]

Answer:

(2,7)

Step-by-step explanation:

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Hey can you help a fella out?
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Step-by-step explanation:

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