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RUDIKE [14]
2 years ago
5

A stack of 4 identical books is 6.28 high. What is the heigh of 30 of these books?

Mathematics
2 answers:
ziro4ka [17]2 years ago
8 0

Answer:<u>47.1</u>

Step-by-step explanation:6.28/4=x/30

                                             188.4=4x

                                              47.1=x

ratelena [41]2 years ago
8 0

Answer:

47.1

Step-by-step explanation:

height of 1 book=6.28÷4=1.57

height of 30 books=1.57×30=47.1

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Vitek1552 [10]

Hello!

3x - 32 = -7x + 28

-32 - 28 = -7x - 3x

-60 = -10x

-6 = -x

6 = x

x = 6

I hope this helps you! Have a lovely day!

- Mal

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2 years ago
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Solve that for me :)
gavmur [86]

Answer:

2/5

Step-by-step explanation:

Out of the available options on the spinner, only 1 and 5 are factors of 25.

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=> Total outcomes = 5

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X^2 + Y^2 +ax + 2y + 3 = 0<br><br> What number is this equation the equation of a circle?
Sav [38]

Answer:

Eq: (x+a/2)²+(y+1)²=(a²-8)/4

Center: O(-a/2, -1)

Radius: r=0.5×sqrt(a²-8)

Mandatory: a>2×sqrt(2)

Step-by-step explanation:

The circle with center in O(xo,yo) and radius r has the equation:

(x-xo)²+(y-yo)²=r²

We have:

x²+y²+ax+2y+3=0

But: x²+ax=x²+2(a/2)x+a²/4-a²/4= (x+a/2)²-a²/4

And

y²+2y+3=y²+2y+1+2=(y+1)²+2

Replacing, we get:

(x+a/2)²-a²/4+(y+1)²+2=0

(x+a/2)²+(y+1)²=a²/4-2=(a²-8)/4

By visual inspection we note that:

- center of circle: O(-a/2, -1)

- radius: r=sqrt((a²-8)/4)=0.5×sqrt(a²-8). This means a²>8 or a>2×sqrt(2)

6 0
3 years ago
A basketball team has won 0.625 of its games. If the team has played 24 games, how many games has the team won?
BlackZzzverrR [31]

Answer:

It has won 15 games.

Step-by-step explanation:

24*.625=15

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CE and FI are parallel, give reasons to prove that DGH is isosceles
Tresset [83]

Answer:

DGH has a different number than Ce and FI

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2 years ago
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