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Gre4nikov [31]
3 years ago
13

Can Someone plz help? Thx

Mathematics
1 answer:
Andreyy893 years ago
8 0

Answer:

7. 2355 m

8. 1570 km

9. 157 cm

10. 40.82 m

Step-by-step explanation:

The circumference of a circle is pi * diameter or 2 * pi * radius.

If you are given the diameter, just multiply it by pi, 3.14.

If you are given the radius, then multiply the radius by 2 and then by pi, 3.14.

7. d = 750 m

circumference = pi * d = 3.14 * 750 m = 2355 m

8. d = 500 km

circumference = pi * d = 3.14 * 500 km = 1570 km

9. r = 25 cm

circumference = 2(pi)r = 2 * 3.14 * 25 cm = 157 cm

10. r = 6.5 m

circumference = 2(pi)r = 2 * 3.14 * 6.5 m = 40.82 m


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Stephon has a square brick patio. He wants to reduce the width by 4 feet and increase the length by 4 feet.
alekssr [168]

Answer:  The expressions for the length and width of the new patio are

\ell=x+4,~~w=x-4.

And the area of the new patio is 384 sq. feet.

Step-by-step explanation:  Given that Stephen has a square brick patio. He wants to reduce the width by 4 feet and increase the length by 4 feet.

The length of one side of the square patio is represented by x.

We are to write the expressions for the length and width of the new patio and then to find the area of the new patio if the original patio measures 20 feet by 20 feet.

Since Stephen wants to reduce width of the patio by 4 feet, so the width of the new patio will be

w=(x-4)~\textup{feet}.

The length of the patio is increased by 4 feet, so the length of the new patio will be

\ell=(x+4)~\textup{feet}.

Now, if the original patio measures 20 feet by 20 feet, then we must have

w=x-4=20-4=16~\textup{feet}

and

\ell=x+4=20+4=24~\textup{feet}.

Therefore, the area of the new patio is given by

A_n=\ell \times w=24\times16=384~\textup{sq. feet}.

Thus, the expressions for the length and width of the new patio are

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4 0
4 years ago
Here's a better picture
schepotkina [342]
1) 3/5=9/x (cross multiply<span>)
3x=5(9)
3x=45
x=15

2) </span>2/4=x/12   (cross multiply<span>)
</span> 2(12)=4x
     24=4x
<span>       6=x

</span>3) 10/x=5/9   (cross multiply<span>)
   10(9)=5x
       90=5x
       18=x
</span>
4) 5/6=x/18
5(18)=6x
90=6x
x=15
7 0
4 years ago
PLEASE HELP ASSAAAPPPPPP
ratelena [41]
A) 1104/ 138 = 8

B) 1st = 30/2 = 15, 2nd = 15/2 = 7.5, 3rd = 7.5/2 = 3.75, 4th 3.75/2 = 1.875, 5th = 1.875/2 = 0.9375, 6th = 0.9375/2 = 0.46875,  7th = 0.46875/2 = 0.234375, 8th = 0.234375/2 = 0.117 = 0.12

Answer is B
7 0
3 years ago
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