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3 years ago

I don’t understand this math at all someone please help !

Mathematics

2 answers:

slavikrds [6]3 years ago

5 0

I believe the answer is -21i

AfilCa [17]3 years ago

4 0

-21 is the answer!! hope it helps <3

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Andre is preparing for the school play and needs to paint the cardboard castle backdrop that measures 14 1/4 feet by 6 feet.

Pani-rosa [81]

Answer:

1. 85.5

2. 3

Step-by-step explanation:

14.25*6=85.5

4 0

2 years ago

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Whats is 3/5 as a percent

likoan [24]

60%; Since 1/5 is .2 or 20% and then multiply that by 3.

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3 years ago

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The length of each side of an equilateral triangle is increased by 20%, resulting in triangle ABC. If the length of each side of

kompoz [17]

Answer: Area of ΔABC is 2.25x the area of ΔDEF.

Step-by-step explanation: Because equilateral triangle has 3 equal sides, area is calculated as

$A=\frac{\sqrt{3} }{4} a^{2}$

with a as side of the triangle.

Triangle ABC is 20% bigger than the original, which means its side (a₁) measures, compared to the original:

a₁ = 1.2a

Then, its area is

$A_{1}=\frac{\sqrt{3} }{4}(1.2a)^{2}$

$A_{1}=\frac{\sqrt{3} }{4}1.44a^{2}$

Triangle DEF is 20% smaller than the original, which means its side is:

a₂ = 0.8a

So, area is

$A_{2}=\frac{\sqrt{3} }{4} (0.8a)^{2}$

$A_{2}=\frac{\sqrt{3} }{4} 0.64a^{2}$

Now, comparing areas:

$\frac{A_{1}}{A_{2}}= (\frac{\sqrt{3}.1.44a^{2} }{4})(\frac{4}{\sqrt{3}.0.64a^{2} } )$

$\frac{A_{1}}{A_{2}} =$ 2.25

The area of ΔABC is 2.25x greater than the area of ΔDEF.

7 0

2 years ago

Show all the steps! 3+2x=13-3x

Goshia [24]

Answer:

x=2

Step-by-step explanation:

3+2x=13-3x

+3x +3x

3+5x=13

-3 -3

5x=10

/5 /5

x=2

Hope this helps! :D

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3 years ago

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2. The absolute value of -8 is 8.

liraira [26]

2. The absolute value of -8 is 8. True
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Nope. It has two

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I have no idea.

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true

6.
The expression 28xyz has 4 terms.
true

7.
Shapes that have the same size and shape are said to be similar.
false

8.
The points where the sides of a polygon meet are called the vertexes.
true

9. A heptagon is a seven-sided polygon.
true (hexagon)

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An acute angle has more than 90° but less than 180°.
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3 years ago