ANSWER
a)56
b)134
c)27
d)141
Are you supposed to estimate or get an exact answer? If you're estimating you can see if the number is close to any perfect squares. In this case 63 is very close to 64, and 48 is very close to 49. The answers can then be estimated to be approximately 8 and 7, respectively.
10:10
11:11
Those are 2 ratios that are correct
Just add up the lengths of the four sides, and you have the perimeter.
The perimeter is:
(4x-7)*2 + (10x^2+4x-2)*2 =
8x-14 + 20x^2+8x-4 =
20x^2 + 16x - 18
Find how many mm are in 25m (by multiplying 25 by 1000) and convert that answer to km.
