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Marysya12 [62]
2 years ago
8

Need help plese it's easy just im stuck

Mathematics
1 answer:
Morgarella [4.7K]2 years ago
5 0
CROSS MULTIPLICATION my friend
Sorry accidentally pressed answer instead of space down
Cross multiplication is multiplying across the = sign by the denominator and numerator. For example, 10/5=3/x
So we multiply across the = sign, giving us that 10x=15
It is much easier to solve from there; divide by 10 on both sides and x=1.5

3/x=4/20
Same principle applies:
60=4x
÷ by 4 (the coefficient of x)
x=15

2/x=6/10
20=6x
x=20/6 - - > 10/3

8/x=4/11
88=4x
x=22

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A regular decagon has sides that are 8 cm long. What is the area of the figure? Round to the nearest whole number.
blsea [12.9K]

<u>Given</u>:

Given that the regular decagon has sides that are 8 cm long.

We need to determine the area of the regular decagon.

<u>Area of the regular decagon:</u>

The area of the regular decagon can be determined using the formula,

A=\frac{s^{2} n}{4 \tan \left(\frac{180}{n}\right)}

where s is the length of the side and n is the number of sides.

Substituting s = 8 and n = 10, we get;

A=\frac{8^{2} \times 10}{4 \tan \left(\frac{180}{10}\right)}

Simplifying, we get;

A=\frac{64 \times 10}{4 (\tan \ 18)}

A=\frac{640}{4 (0.325)}

A=\frac{640}{1.3}

A=642.3

Rounding off to the nearest whole number, we get;

A=642 \ cm^2

Thus, the area of the regular decagon is 642 cm²

Hence, Option B is the correct answer.

5 0
2 years ago
What is the volume of the triangular prism?
nekit [7.7K]
12 if not just look it up on quiz lit and you’ll get it it’s on safari or use scan and solve
3 0
2 years ago
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Can someone help me with this i am confused
Eva8 [605]
Plot each point on a graph , then count how many you need to go up and then over in this case it is 8 over 1 then calculate the y int so y= 8x -25
6 0
2 years ago
HELPP I'LL MARK BRAINLIESTT
Crazy boy [7]

Answer:

Jamal and Gary

Step-by-step explanation:

lets say that t=5

Jamal- 12<(5)+12     true

Gary- 6>0.5(5)     true

Nancy- 30-(5)<18     false

Hope this helps!

8 0
3 years ago
Luisa solves for x in the equation 9(1/3) + 8x = 4( 2x + 3/4)
Maru [420]

Answer:

x = all real numbers because this equation is an identity

Step-by-step explanation:

9 (1/3) = 9*1/3 = 3

3 + 8x = 4(2x + 3/4)

3 + 8x = 8x + 3

x = all real numbers because this equation is an identity

7 0
2 years ago
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