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const2013 [10]
3 years ago
12

Out of 820 discs tested, 33 are defective. Estimate the number of defective discs in a batch of 17,000.

Mathematics
2 answers:
Zina [86]3 years ago
7 0
684 discs would be correct
Vlada [557]3 years ago
4 0

Answer:

684 discs

Step-by-step explanation:

33/820 were defective

17,000/820= 20.73

20.73*33

684 discs

-you could also do 4% of 17,000

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Your electric bill has been as follows for the past six months:
kakasveta [241]

You want to find the monthly average over the past 6 months.


July: $78.56

August: $30.21

September: $81.20

October: $79.08

November: $66.18

December: $100.75


Add all of these up

(July) $78.56

(August) $30.21

(September) $81.20

(October) $79.08

(November) $66.18

(December) + $100.75

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

(Total cost) $435.88


There are 6 months you are calculating for, therefore divide the total (combined) cost of 6 months with the total number of months (in this case, 6)


$435.88 (total cost of 6 months) ÷ 6 (months)


The average cost per month of over the past 6 months is $72.66.

4 0
3 years ago
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In which quadrants do solutions for the inequality y is less than or equal to two sevenths times x plus 1 exist?
hram777 [196]

Answer:

y will be in every single quadrant

Step-by-step explanation:

So we have the equation y\leq \frac{2}{7} x+1  first we will have to look at the equation. It says that y is less than or equal to \frac{2}{7} x+1 since y is less than \frac{2}{7} x+1 the only place the shaded area where y can be is under the line that is drawn be the equation. When the equation is graphed the y-intercept will be on positive 1 it since slope is rise over run it will look something like the file attached to this. so under the line you can see every single quadrant so that is why it would be that way

5 0
3 years ago
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tino4ka555 [31]

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3 0
3 years ago
Solve using elimination.<br><br> 8x − 7y = –5<br> –x + 4y = –15
xz_007 [3.2K]
Steps
8x−7y=−5
Add 7y to both sides
8x−7y+7y=−5+7y
Simplify
8x=−5+7y
Divide both sides by 8
8x
8 =−
5
8 +
7y
8
Simplify
x=
−5+7y
8

7 0
3 years ago
Read 2 more answers
Alison does 8 math problems in 2 minutes. How long will it take her to do a set of 160 problems?
erastovalidia [21]

Answer:

40 min

Step-by-step explanation:

find unit rateeee  p=problems

8 p= 2 min

8/2=4

so Alison can do 4 math problems per minute

so 160/4= 40 minutes

hope this helps

5 0
3 years ago
Read 2 more answers
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