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balu736 [363]
4 years ago
10

Which expression represents the average of three test scores?

Mathematics
2 answers:
jek_recluse [69]4 years ago
3 0
The answer is the third option. add up all the test scores and divide them by the number of people whose scores you added
which would be three people
guajiro [1.7K]4 years ago
3 0
Hi.

The mean of 3 test scores can be represented as:

<em />\frac{x + y + z }{3}

~


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Jacklynn wondered how much of the moon covers if half of the moon is shaded. She learned in Science Class that the moon has radi
Lesechka [4]

Answer:

6.3 × 10⁶ square miles

Step-by-step explanation:

We are given,

The radius of the moon is approximately 1000 miles.

We know that the moon resembles a sphere and also,

Area of sphere = 4\pi r^{2}, where r is the radius.

Now, the area of the moon = 4\pi 1000^{2} = 1.26 × 10⁷ square miles

Since, only the half of the area is clear to view.

So, the area left to view = \frac{1.26\times 10^7}{2} = 6.3 × 10⁶ square miles.

Hence, the area of the moon in view is 6.3 × 10⁶ square miles.

8 0
4 years ago
The distance around the edge of a pond is 88. What is the radius?
Airida [17]

Answer:

radius= 14

Step-by-step explanation:

the distance around the edge is given by = 2πr

  88= 2 (22/7)*r⇒ r= 88*7/44= 14

8 0
3 years ago
What fractions are equivalent to 6/12
kirill [66]

Answer:

Step-by-step explanation:

1

2

is equivalent to 6

12

because 1 x 12 = 2 x 6 = 12

2

4

is equivalent to 6

12

because 2 x 12 = 4 x 6 = 24

3

6

is equivalent to 6

12

because 3 x 12 = 6 x 6 = 36

4

8

is equivalent to 6

12

because 4 x 12 = 8 x 6 = 48

7 0
3 years ago
7x + 2y = 17<br>2x - 2y = 1<br>=​
DerKrebs [107]

Answer:

(2,\frac{3}{2}})

Step-by-step explanation:

For finding the system of equations you can use one of two methods. There's the elimination method and also the substitution method. For this I think the best way we could go at solving this is by using the elimination method. Since we can eliminate the 2y. We can then solve for x and then we'll go from there.

\left \{ +{{7x+2y=17} \atop {2x-2y=1}} \right. \\\\9x=18\\x=2

Now that we know what x is we can substitute it for one of the equations and then we will be able to solve for y.

7x+2y=17\\7(2)+2y=17\\14+2y=17\\2y=3\\y=\frac{3}{2}

So now we have the x and the y and once we place them together we can get the solution of those two equations, and the solution is (2,\frac{3}{2}}).

5 0
3 years ago
Solve the system of equations algebraically show all work. <br><br> Y=-x^2+8x+11<br><br> Y=5x-7
morpeh [17]

Answer:

ummmm..... let's see..

Step-by-step explanation:

using "Almighty formula"

{Y = –x +/– √b^2 – 4ac / 2a}

so we name all the values behind the coefficients which are; –1^2, 8 and 11

so let's assign a,b,c to these values:

a =–1, b =8, c = 11

all you just do now is to add these values to the formula

you should be having Y =1 +/– √8^2 – 4×–1×11

———————————

2×–1

Y =1 +108

———— or Y = 1–108

–2 –––––

–2

now add and divide to get Y.

(your answer will be two)

5 0
2 years ago
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