MATHEMATICS MIDDLE SCHOOL

Can someone please help? I will give thanks and 5 stars, and if possible, brainlist, if you explain how to solve the question.

Answers

Answer 1

Answer:

1/14

Step-by-step explanation:

Odd numbers: 5, 7, 9

3/7 × 1/6

1/14

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Solve the system of equations and choose the correct answer from the list of options. (4 points)x − y = 7
y = 3x + 12

Select one:
a. 2 /19 comma 2 / 33
b. negative 2 / 19 comma negative 33 / 2
c. negative 19 / 2 comma negative 33 / 2
d. 19 / 2 comma 33 / 2

Answers

Answer:

c. negative 19 / 2 , negative 33 / 2

Step-by-step explanation:

x − y = 7

y = 3x + 12

Substitute y = 3x + 12 into x − y = 7

x − (3x + 12) = 7

x - 3x - 12 = 7

-2x - 12 = 7

-2x = 19

x = -19/2

Substitute x = -5/2 into x − y = 7

-19/2 − y = 7

y = -19/2 - 7

y = - 5/2 - 14/2

y = -33/2

Answer:

x = -19/2, y = -33/2

Three bags of packing peanuts are used to fill 2 boxes. How many bags of packing peanuts does each box use? Between which two whole numbers does the answer lie?

Answers

1 1/2
and the answer lies between 1 and 2

can i have brainliest answer if it is right ofcourse

1 1/2 i think thats the answer i think im pretty sure

~~~20 POINTS~~~
Please answer these two math questions for me :)

Answers

Foreword

"Please tell Kat that Brainly gives half the points she selects to each user that answers the question."

The Answers

#1:
We are trying to find the MAD for each set of the teachers' grades. To find the MAD (again) find the mean of the teachers' grades. Then, take each of the teachers' grades and find the absolute value of the difference between that grade and the mean grade. Add the differences up, and divide the result by the number of teachers (10).

Do the first table first (first things first!). Find the mean by adding up the grades and dividing them by the number of teachers (10).

76 + 81 + 85 + 79 + 89 + 86 + 84 + 80 + 88 + 79 = 827
827/10 = 82.7

The mean grade for the first table is 82.7.

Now, we need to find the absolute value of the difference between each of the teachers' grades and the mean.

82.7 - 76 = 6.7

82.7 - 81 = 1.7

85 - 82.7 = 2.3

82.7 - 79 = 3.7

89 - 82.7 = 6.3

86 - 82.7 = 3.3

84 - 82.7 = 1.3

82.7 - 80 = 2.7

88 - 82.7 = 5.3

82.7 - 79 = 3.7

Now, we need to add up the result.
6.7 + 1.7 + 2.3 + 3.7 + 6.3 + 3.3 + 1.3 + 2.7 + 5.3 + 3.7 = 37

Now, we divide the result by the number of teachers.
37/10 = 3.7

So the MAD for the first table is 3.7.

Now we do the same thing for the second table.

$Mean= (sum\ of\ grades)/(10)$

79 + 82 + 84 + 81 + 77 + 85 + 82 + 80 + 78 + 83 = 811
811/10 = 81.1

Bad grades.

$MAD= (absolute\ value\ of\ difference\ of\ each\ grade\ from\ the\ mean)/(10)$

81.1 - 79 = 2.1

82 - 81.1 = 0.9

84 - 81.1 = 2.9

81.1 - 81 = 0.1

81.1 - 77 = 4.1

85 - 81.1 = 3.9

82 - 81.1 = 0.9

81.1 - 80 = 1.1

81.1 - 78 = 3.1

83 - 81.1 = 1.9

Add.
2.1 + 0.9 + 2.9 + 0.1 + 4.1 + 3.9 + 0.9 + 1.1 + 3.1 + 1.9 = 21
21/10=2.1

Now, we compare the MAD's. If the MAD for the second table is greater than the MAD for the first table, then the teachers have not improved/were sleeping. If not, then the teachers have improved/got lucky.

$MAD_(1st\ table)=3.7$

$MAD_(2nd\ table)=2.1$

Hooray! They improved/got lucky, by 1.6 points to be precise.

#2:
Remember from the previous answer I gave (the other question you asked) the example with a MAD of 0? That's because they were all exactly on the mean (4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 40, 40/10 = 4, MAD = 0). Therefore, if the MAD of the teachers' grades was zero, that means they all got the same score! Hooray! Mission accomplished. Or the common core machine has succeeded in producing identical copies of teachers.

Backword

I hope you know what the MAD is now.

$x ^(2) - 8x = 3$ solve by factoring please. I really need help I have no clue how to solve by factoring like I forgot the steps so can u work the steps out also please

Answers

Answer:

$x = 4 + √(19)$

Step-by-step explanation:

To solve by factoring, complete the square by dividing 8 from 8x in 2. Then square the result 4 to get 16. Add 16 to both sides.

$x^2 -8x = 3\n\nx^2 - 8x + 16 = 3 + 16\n\n(x-4)^2 = 19$

The equation is now factored. To solve, take the square root of both sides and solve for x.

$√((x-4)^2) = √(19)\n\nx-4 = √(19) \n\nx = 4 + √(19)$

Sir Dwayne is in charge of dragon designs at the King's ToyFactory. He hopes that his new designs will please the king
*Your Highness," he says. "I have the plans for the toy
dragons. If it pleases you, every 3rd dragon shall billow
clouds of smoke through its nostrils. every 4th dragon shall
breathe fire, every 6th dragon shall have glowing eyes, and
every 8th dragon shall have a tail with spikes on it. i shail
make 100 dragons." The king asks. Sir Dwayne, how many
dragons shall have more than one of these
characteristics?" Sir Dwayne doesn't have the answer. Can
you help him answer the king before he is thrown into the
dungeon?

Answers

Answer:

24 dragons

Explanation:

Any multiple of 3 and 4shall blow clouds of smoke through its nostrils and breathe fire. Those are:

the 12th, the 24th, the 36th, the 48th, the 60th, the 72nd, the 84th, and the 96th dragons.

Hence, that is 8 dragons that shall have both characteristics.

Any multiple of 6 shall have glowing eyes. The common multiples of 6 and 3 are: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90, and 96.

Then, that adds:

the 6th, 18th, 30th, 42nd, 54th, 66th, 78th, and the 90th dragons:

Hence, add 8 more dragons.

And the common multiples of 6 and 4 are: 12, 24, 36, 48, 60, 72, 84, and 96, all of which are already included.

Any multiple of 8 shall have a tail with spikes on it. Then, you must find the common multiples of 8 and 3, 8 and 4, and 8 and 6.

Common multiples of 8 and 3 are: 24, 48, 72, and 96, which are already included.

Common multiples of 8 and 4 are: 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, and 96. Then, you must add:

the 8th, the 16th, the 32th, the 40th, the 56th, the 64th, the 80th, and the 88th.

Those are other 8 dragons.

At the endthe number of dragons that shall have more than one of these characteristics is:

8 + 8 + 8 = 24

What is the fraction 36/80 expressed in lowest terms?

Answers

Reduce the expression by cancelling the common factors.
9/20

Exact Form:
9/20

Decimal Form:
0.45

Look for common factors and divide them out of both numerator and denominator at the same time.
You know they're both divisible by 2, so you can simplify to 18/40.
As you can see, both numbers are still divisible by 2, so you can go down to 9/20.
At this point, they have no common factors, so the fraction is in lowest terms.