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Very good! DING DING DING you sir are correct.

This looks hard.  Is there a diagram?

Also the answer to my previous riddle was Pride.

Just an observation.  This question adheres to the standard format for multiple choice questions.  Of the choices of answers, 

              1 choice is correct,                    EP's excellent analysis shows us how to deduce that 56^o is correct. 

              1 choice is almost correct,         62^o is close enough to 56 that you can't tell tell them apart by eye. 

              1 choice is wrong,                      You can tell that 34^o is wrong because that size angle is too acute. 

              1 choice is ridiculous.                 124^o is obtuse, impossible for an internal angle of a quadrilateral.   

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****deleted***incorrect*****

After reading your question again    ' More than 93%.....' :

I feel the answer is  20

19 girls would be 95%

1 boy would be 5%   

Since  we can only  have integer results......the  number of girls  could be .94 * 50  = 47

So....the  number  of  boys  =  50 * . 06  =  3

So....the smallest possible class size =   50

L = 2W

H = 6W

Surface area  =   2 (WL + HL + HW)....so we  have

1000 =  2 [ ( W (2W)  + (2W)(6W)  + W(6W) ]       simplify

1000  =  2  [ 2W^2  + 12W^2  + 6W^2 ]

1000  =  2 [ 20W^2]

1000  = 40W^2         divide both sides  by  40

1000 /40 =  W^2        

100/4  =   W^2       

25  =  W^2      take the positive  root

5  =  W     

So.....L = 2W   =  10

And  H  =  6W =  30

So...the  volume  =  W * L * H  = ( 5) ( 10)  ( 30) =   1500 cm^3

Nicely explained, hugo  !!!

1. We can write

y = -2x -11          get x by itself

y +11  = - 2x

[ y +11]  / -2  =  x

- [ y +11]  / 2  =  x       "swap"  x and y

- [x + 11]  / 2  =  y  =  f^-1(x)

2. h(x)  vertically  "stretches"  f(x)  by a factor  of 3  and  the "-"  flips this over the x axis

See  the graph here : https://www.desmos.com/calculator/9fq01ty1j3

3. This  has an inverse  but  it will not be a function......

f(x)  = x^2 + 7x + 9    is a parabola  that turns upward.......thus.....it will not pass the horizontal line test  [ a horizontal line drrawn through the function will cut the function in more than one place......so....not one-to-one ]

So....if the original function is not  one-to-one , then it won't have an inverse over its entire domain

Just copy it and paste in the calculator on this site like this: (2.1e-10) * 1 =0.00000000021

143 * 2 in base 5 = 341 in base 5

OK.....thanks for the heads-up, hugo   !!!!

See this page: https://artofproblemsolving.com/school/mathjams-transcripts?id=151