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IRINA_888 [86]
4 years ago
14

Jeff answered all 25 questions on his chemistry test. For each right answer, he got 4 points and for each wrong answer he lost 2

points. If he got a score of 70 points, how many questions did he get right?
Mathematics
1 answer:
timurjin [86]4 years ago
5 0

Answer:

Jeff got 20 answers right.

Step-by-step explanation:

The maximum number of points Jeff can get is 100. (25 * 4) However, for each question he gets wrong, he's actually losing 6 points because he doesn't get the four points for getting right, and has the additional -2 points for getting it wrong. Since he only got a score of 70, that means he lost 30 points.

30/6 = 5. So he missed 5 question and got 20 question right.


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meriva

Hope this helps!

C. October 15

3 0
3 years ago
What is the value of m in the equation <img src="https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D" id="TexFormula1" title="\frac{1}
Novosadov [1.4K]

Answer:

The value of m is 44

Step-by-step explanation:

We have given:

1/2 m - 3/4 n = 16

Put the value of n in the given equation

1/2m - 3/4(8)=16

Now 4 and 8 will be canceled out by the table of 4

1/2 m - 3(2)=16

1/2m - 6 = 16

Now take the L.C.M of the denominator and solve for numerator:

m-2(6)/2 = 16

m-12/2 = 16

m-12 = 16*2

m-12 = 32

Add 12 at both sides:

m-12+12 = 32+12

m= 32+12

m=44

The value of m is 44....

6 0
3 years ago
Read 2 more answers
I need help, forgot how to answer this?
Gemiola [76]

All three angles in a triangle add up to 180 degrees.

Therefore, we should just add up all the angles given to us and set them equal to 180 :)

3x + 5x + (2x + 5) = 180

Now we just need to combine all the similar terms together (which is the 3x, 5x, and 2x):

10x + 5 = 180

Subtract 5 from both sides of the equation:

10x = 175

Now just divide by 10 on both sides to isolate the x and work out your value:

x = 17.5

Therefore, your final value of x is 17.5 :)

3 0
3 years ago
You install 580 feet of fencing along the perimeter of a rectangular yard. The width of the yard is 144 feet. What is the length
muminat
<h3>Answer:   146 feet</h3>

==========================================================

Explanation:

  • P = 580 is the perimeter of the rectangle
  • W = 144 is the width
  • L = unknown length

The units for each are in feet.

The formula tying together all three variables is

P = 2(L+W)

which is the same as saying

P = 2L+2W

We can think of it having two copies of L and two copies of W, four sides total, added together to get the full perimeter.

I'll go with the first version. Plug in the given values and solve for L

P = 2(L+W)

2(L+W) = P

2(L+144) = 580

L+144 = 580/2

L+144 = 290

L = 290-144

L = 146 feet is the length

---------------

We can confirm this by saying

P = 2(L+W) = 2(146+144) = 2*290 = 580

Or we could say

P = 2L+2W = 2*146+2*144 = 292+288 = 580

or,

P = L+W+L+W = 146+144+146+144 = 580

3 0
3 years ago
3/8 divided by 10 1/2
kenny6666 [7]
I think that it is 0.035 or 3/100
5 0
3 years ago
Read 2 more answers
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