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denis-greek [22]
3 years ago
12

Two spinners are spun 20 times. A sum of 7 is landed on 5 times. What is the experimental probability of spinning a sum of 7?

Mathematics
1 answer:
statuscvo [17]3 years ago
8 0
7/20 is the probability
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F 9 is added to twice a number and this sum is multiplied by 4​, the result is the same as if the number is multiplied by 4 and
riadik2000 [5.3K]
Let
x---------> the number

we know that
[9+2x]*4=4x+12
36+8x=4x+12
8x-4x=12-36
4x=-24
x=-24/4
x=-6

the answer is
-6
8 0
3 years ago
Evaluate: 2·5\4^-2 <br> A) 5\8 B<br> B) 8\5 <br> C) 40 <br> D) 160
alexandr402 [8]
D. 160 you simplify the expression to get your answer.
3 0
3 years ago
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What is the radius of a circle whose equation is x2 + y2 + 8x – 6y + 21 = 0?
s344n2d4d5 [400]

Answer:

2 units

Step-by-step explanation:

The given equation of the circle is:

x^{2} + y^{2}+8x-6y+21=0

The general equation of the circle is:

x^{2} + y^{2}+2gx+2fy+c=0

Comparing the given equation with the general equation we can say:

g = 4

f = -3

c = 21

The formula for radius of the circle is:

radius=\sqrt{g^{2} +f^{2} -c }

Using these values of the given circle, we get:

radius=\sqrt{(4)^{2}+(-3)^{2}-21}\\\\radius=\sqrt{4}\\\\radius=2

Therefore, the length of radius of the given circle is 2.

3 0
3 years ago
What is the area of a square with the side length 3a
ladessa [460]

the area of a square = length*length =3a*3a=9a^2

4 0
3 years ago
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Lola gets two 20-minute breaks at work each day. She works 5 days a week. How much time does she spend on break each week?
Maslowich

Answer:

200 minutes / 3 hours & 20 minutes.

Step-by-step explanation:

This is quite simple.

First, since we know that Lola takes two 20 minute breaks at work each day, let's multiply 20 and 2.

20 × 2 = 40

This means she is on break for a total of 40 minutes each day.

Finally, let's take that 40 and multiply it by 5.

40 × 5 = 200

This means she spend 200 minutes (3 hours & 20 mins) on break each week.

8 0
3 years ago
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