The answer is 8 3/4. Hope this helps
Your original fraction was probably greater than 1/2 because if it was less than you wouldn't be able to divide it.
Y=x^2-3 for the third picture
We just multiply the scale to the dimensions
2 in to original is: 2×40= 80 cm
or do proportions:

=

=

=x
=80 cm=x the original dimension.
Same thing to the other side.
1.5×40=60 cm
or proportions again:

=


=y
60 cm=y
60 cm is the original dimension
80 cm times 60 cm ORIGINAL DIMENSION
A quotient of a number 21 is 3 and 63
Hope this helps!