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lana [24]
3 years ago
13

If 3 times a certain number is increased by 4 the result is 28. What is the number?

Mathematics
1 answer:
k0ka [10]3 years ago
8 0

x = number

the equation to use is: 3x+4=28


3x+4=28

3x=24

x-24/3 =8

x=8


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in a square garden plot (with an area of 400 sq ft)deer fencing priced at $1.50 per foot is to be installed around the plot. if
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We have a square garden of 400 square foot.

The area of a square is:

A=x^2

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\begin{gathered} A=400=x^2 \\ x=\sqrt[]{400}=20\text{ ft} \end{gathered}

The perimeter of the square is the sum of the lengths of the sides of the square. As they are all equal, we can write:

P=4x=4\cdot20=80\text{ ft}

The fencing is priced at $1.50 per foot. If we add the 7% sales tax to this price we get:

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We can calculate the total cost by multiplying the sales price ($1.605 per foot) and the perimeter (80 ft):

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Answer: the fencing will cost a total of $128.40

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