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3 years ago

HELPPPPPPPPPPPPMEEEEEEE

Mathematics

1 answer:

Alexus [3.1K]3 years ago

4 0

Answer:

I'm pretty sure it is 21

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Jordan’s house cost $100000 in the year 2000. In 2008 she sold it for 90000. What was the percentage of change in the price of t

Aleks [24]

Answer:

There would be a 10% decrease/change

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3 years ago

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HELP ME!!! I BEGG , HELP

julia-pushkina [17]

1.) 9.1 kb
2.) 12.32 cm
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Just simple adding and subtracting. I hope this helps hun!

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4 years ago

Determine is its a triangle

d1i1m1o1n [39]

Answer:

10,24,26 right triangle

9,16,21 no

hope this helps you out

3 0

3 years ago

Rose, Bette and Cindy equally shared 5 boxes of crayons. Write an equation to show how much each girl got. (each box of crayons

labwork [276]

Since there was five boxes of crayons and there was 3 crayons in each one, the would be 15 in total. (crayons) And there was three people, 15/3=5 crayons per person.
Equation: 3x=15
x stands for the amount of crayons each person gets.

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3 years ago

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Help 80 points A concrete planter is formed from a square-based pyramid that was inverted and placed

Rufina [12.5K]

Answer:

The slant height of the pyramid refers to the height of a face of the pyramid.

Notice that each slant height forms a right triangle like the image attached shows, where the hypothenuse is the slant height. Additionally, the bottom leg is 1 yard, because is half of the base side, and the other leg is 2 yard. Using Pythagorean's Theorem, we have

$h^{2} =1^{2} +2^{2} \\h=\sqrt{1+4}=\sqrt{5}$

Therefore, the slant height is the square root of 5 yard.

The surface area of the composite figure is the sum of the surface area of both volumes.

<h3>Surface area of the cube.</h3>

$S_{cube}=5(2yd)^{2} =20 yd^{2}$

Notice that we only included 5 faces of the cube, that is because the sixth is the base of the pyramid, so if we include it here, we would have the wrong total surface area.

<h3>Surface area of the pyramid.</h3>

$S_{pyramid}=\frac{1}{2}pl$

Where $p$ is the perimeter of the base and $l$ is the slant height.

$S_{pyramid}=\frac{1}{2}(8yd)(\sqrt{5}yd )=4\sqrt{5}yd ^{2}$

Therefore, the surface od the composite figure is

$S_{total}=20yd^{2} +4\sqrt{5} yd^{2} \approx 29.94 yd^{2}$

To find the cubic yards of concrete, we need to subtract the volume of the figures, because the concrete would be inside the space between the cube and the pyramid.

$V_{concrete}=V_{cube} -V_{pyramid}=l^{3}- \frac{1}{3}l^{2}h$

Where $l=2yd$ and $h=2yd$

$V_{concrete}=2^{3}-\frac{1}{3}(2)^{2} (2)=8-\frac{8}{3} \approx 5.33 yd^{3}$

Therefore, it would be needed 5.33 cubic yards of concrete to make the planter.

8 0

3 years ago