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Svetach [21]
2 years ago
9

a teacher takes 15minutes to mark one question paper. how many hours will he take to mark 40 question papers?​

Mathematics
2 answers:
garri49 [273]2 years ago
6 0

Answer:

3 question papers

Step-by-step explanation:

If the teacher takes 15 minutes to mark 1 question paper. Then they will probably take 30 minutes to grade 2 question paper. Because 15 minutes+15 minutes=30 minutes. Then if you and another 15 minutes which will be 40 minutes because 15 minutes+15 minutes+15 minutes=40 minutes.

Hence, the teacher will mark 3 question papers in 40 minutes

Katyanochek1 [597]2 years ago
4 0

Answer:

It will take 13 hours 20 minutes

Step-by-step explanation:

The solution is in image

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Which of the following is a perfect square trinomial?
shutvik [7]

Answer:

A.

Step-by-step explanation:

Take a look at what happens when squaring either of these...

(ax-by)^2=(ax-by)(ax-by)=a^2x^2-2abxy+b^2y^2\\\\(ax+by)^2=(ax+by)(ax+by)=a^2x^2+2abxy+b^2y^2\\

Notice a couple of patterns.

1.  The last term has a positive coefficient.  That rules out answer choices C and D.

2.  The coefficient of the middle term is either +2ab \text{ or } -2ab .  So what are <em>a</em>  and <em>b</em>?  <em>a</em> is the square root of the x^2 term and <em>b</em> is the square root of the y^2 term.

25x^2 \Rightarrow a=5\\\\9y^2 \Rightarrow b=3\\\\ab=15\\\\2ab=30

The middle coefficient needs to be either +30 or -30.  The answer is choice A.

5 0
3 years ago
Prime factor tree of 385
timama [110]


11*5*7 

385 breaks down to 7 and 55. Bring the seven down. Break 55 down to 11 and 5. Then bring those down and you get 11*5*7

4 0
3 years ago
1200 students attend Ridgewood Junior High School. 5% of students bring their lunch to school everyday. How many students brough
pantera1 [17]

Answer:

Your answer is 60 kids brought there lunch to school on Thursday.

Step-by-step explanation:

1200*.05 = 60

5 0
3 years ago
What is the least common denominator of 1/2 and 9/10
nirvana33 [79]

Answer:the least common denominator is 10 because 5x2 is 10 and then 10x1 is 10 its the least for both of them

Step-by-step explanation:

3 0
1 year ago
Car park algebra question
Svetllana [295]
You did south, north, correctly

but last one

twice north is 2 times (x+48) or 2x+96


so

s=x
n=x+48
c=4x
s+c>2x+96
subsitute s for x and 4x for c
x+4x>2x+96
5x>2x+96
minus 2x both sides
3x>96
divide both sides by 3
x>32
it cannot be equal to 32 so
the minimum value is 33 spaces in south car park
5 0
3 years ago
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