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professor190 [17]
3 years ago
12

Find the average (mean) of the following test scores 82,92,47,78,80

Mathematics
2 answers:
kaheart [24]3 years ago
7 0

Answer:

add everything together first then divide by how many whole numbers there are

Step-by-step explanation:

82+92+47+78+80=379

379/5=75.8

hope that helped have a good day

Mrac [35]3 years ago
6 0

Answer:

75.8

Step-by-step explanation:

add up all test scores then divide them by the number of test scores

82+92+47+78+80= 379

379/5= 75.8

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m = 10x - x

  • Combine like terms.

m = 9x

  • Divide both sides by 9.

x = m/9

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3 years ago
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*math please help brainliest*
valentinak56 [21]

Answer:

\dfrac{3x+4}{2x-2}

Step-by-step explanation:

Invert and multiply the way you would any fraction division problem. Then cancel common factors from numerator and denominator.

\displaystyle\frac{\left(\frac{4x^2+2x}{x^2+x-2}\right)}{\left(\frac{8x^2+4x}{3x^2+10x+8}\right)}=\frac{4x^2+2x}{x^2+x-2}\cdot\frac{3x^2+10x+8}{8x^2+4x}\\\\=\frac{2x(2x+1)(3x+4)(x+2)}{4x(2x+1)(x-1)(x+2)}=\frac{3x+4}{2(x-1)}\\\\=\frac{3x+4}{2x-2}

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3 years ago
A sapling grew 8 1/2 inches one year 10 3/4 inches the second year and 9 3/4 inches the third year how much did it grow during t
victus00 [196]
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2 years ago
Which equations support the fact that rational numbers are closed under subtraction?
Illusion [34]

Answer:

A rational number is said to be closed if the subtracted values and the result obtained are rational. Hence, the equations which supports the condition are :

5.5 - 0.5 = 4

5√4 - √4 = 4√4

Step-by-step explanation:

A.)

√8 - √8 = 0 ; the added values aren't rational and the result, Zero is not rational either.

B.)

5√4 - √4 = 4√4

5(2) - 2 = 2(2)

10 - 2 = 4

All the values in the expression are rational ; hence, it supports the assertion.

C)

5.5 - 0.5 = 4 ; all the values in the expression are rational, hence, it supports the fact.

2√3 - √3 = √3 ; the values in the expression are not rational, hence, it does not meet the condition.

Therefore, only options B and C supports the assertion.

Let me add that I learned most of this from Brainly a user named fichoh :)

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Answer:

Option 3rd is correct

Step-by-step explanation:

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