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Natasha_Volkova [10]
2 years ago
11

Find the value of x? Please help?

Mathematics
1 answer:
quester [9]2 years ago
6 0

Answer:

x=7

Step-by-step explanation:

x+5=3x-9

<u>    +9    +9</u>

x+14=3x

<u>-x       -x</u>

<u>14=2x (divide by 2)</u>

   2

7=x

Check answer:

<u>7+</u>5= 12 (substitue x)

3(7)-9= 12 (substitute x)

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In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Joyce has s
d1i1m1o1n [39]

Answer:

66 ≤ f ≤100

Explanation

Mean= ( Σ x ) / n

Mean= sum of scores/ number of subject she took

Now, she already too 3 subject which sum is 85+83+86=254

Now we need to know range of score for her to have (grade) a mark between 80 and 89

Now let take the lower limit mean=80

The lowest score she can get is

Mean = ( Σx) / n

80=(85+83+86+f)/4

80×4= 254+f

Therefore, f= 320-254=66

Therefore the minimum score she can have to have a B is 66.

Then, let take the upper limit mean 89. i.e the maximum she can have so that she don't have an A grade.

Mean = ( Σx) / n

89=( 83+85+86+f)/4

89×4= 254+f

f= 356-254

f=102.

Therefore this shows that she cannot have an A grade in the exam. The maximum score for the exam is 100.

There the range of score is 66 ≤ f ≤100 to have a B grade

66 ≤ f ≤100 answer

Since she cannot score 102 in the examination.

8 0
3 years ago
What's the circumference of a circle with a diameter of 9 inches?​
yaroslaw [1]

Answer:

9pi

Step-by-step explanation:

circumference= 2 (pi) (r)

radius = diameter \ 2

r = 9 \ 2 = 4.5in.

c = 2 (pi) (4.5)

c = 9pi or 28.3in.

Hope this helps!

3 0
3 years ago
Question:<br> 7x^2 + 8x = x^2
7nadin3 [17]

Answer:

x1= -4/3 and x2= 0

Step-by-step explanation:

5 0
3 years ago
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A recipe for pancakes calls for 1 cup of pancake mix and 3/4 cup of milk. How much milk is needed to make 1/2 the recipe
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I would think you would use 1/3 of a cup but I am not sure.Hope it helps!
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3 years ago
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If CF = 5, CD = 12, and EF = 5, what is the perimeter of triangle CDE?
Basile [38]

Answer:

The perimeter of triangle CDE is 34.

Step-by-step explanation:

To find the perimeter of a triangle, you have to add all the sides together, since this looks like a isosceles triangle, you would make side ED also 12 and then just add them all together.

12+12+5+5= 34.

8 0
3 years ago
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