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Alona [7]
3 years ago
11

Mary is three times as old as her son . In 12 years Mary will be twice as old as her son. How old is each of them now?

Mathematics
1 answer:
RideAnS [48]3 years ago
5 0
In twelve years Mary will be 45 and her son will be 23.
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find the area of a regular hexagon with an apothem 10.4 yards long and a side 12 yards long. round your answer to the nearest te
irakobra [83]
The answer is 374.4 yards.

There are 2 ways to calculate the area of a <span>a regular hexagon.
It is given:
apothem: b = 10.4 yards
side: a = 12 yards

1. The direct way is to use the formula for the regular hexagon without using an apothem:
</span>A= \frac{3 \sqrt{3} }{2} a^{2}
<span>where
A - the area of the </span><span>hexagon
a - the side of the </span><span>hexagon

Therefore:
</span><span>A= \frac{3 \sqrt{3} }{2} 12^{2}
</span><span>A= \frac{3 \sqrt{3} }{2} 144
</span><span>A= 374.4
</span>
2. The indirect way is to sketch the hexagon with 3 diagonals and create 6 triangles. Then, it is necessary to calculate the area of one triangle and multiply it by 6. In this triangle, apothem is actually the height.
The area of the hexagon is:
A = 6 · A₁
where:
A - the area of the <span>hexagon,
</span>A₁ - the area of the triangle

A_{1}= \frac{a*h}{2}

where
h - <span>height of the triangle.
</span>

Since apothem (b) of the hexagon is the height (h) of the triangle, then:
A_{1}= \frac{a*h}{2}
<span>A_{1}= \frac{12*10.4}{2}
</span><span>A_{1}= 62.4
</span>
Thus, the area of one triangle is 62.4 yards.

To calculate the area of the hexagon, we will multiply it by 6:
<span>A = 6 · A₁
</span><span>A = 6 · 62.4
</span>A = 374.4 yards

<span>In both cases, the result is 374.4 yards.</span>The answer is


5 0
4 years ago
Write an equation in slope-intercept form for the line with slope 34 and y-intercept −9.
Phantasy [73]

Answer:

y=34x-9

y=mx+b is the formula

6 0
4 years ago
Which answer describes the calculations that could be used to solve this problem?
Zanzabum
THe answer to ur problem is:

A


8 0
4 years ago
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Find the perimeter of the figure to the nearest hundredth.
Fiesta28 [93]

Answer:

20

Step-by-step explanation:

The formula used to find the area of a rectangle is A = l * w. The formula used to find the perimeter of a rectangle is P = 2 * (l + w) In the above formulas, A stands for “area,” P stands for “perimeter,” l refers to the length of the rectangle, and w refers to the width of the rectangle.

4 0
3 years ago
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A rectangular pyramid has a height of 15 cm. What is the volume of the rectangular pyramid in cubic feet?
Sergio039 [100]

Answer:

The answer is 360

Step-by-step explanation:

the formula for the volume of a rectangular based pyramid is 1/3 times the base area times the height and the height is given as 15 cm the base parameters are 9 and 8 respectively so deep area of the rectangular base is 9 * 8 * 15 that is 1080 x 1/3 which is 360

7 0
3 years ago
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