Hi
Can anyone please help me with question 13 (core) question 9 (number patterns) and question 9 (matrices) from 2014 exam 1
Thank you
For question 13:
1. Divide the graph into three regions, were the regions have 5, 6, 5 data points respectively
2. Calculate the median value of the first region (3, 8 )
3. Calculate the median value of the third region (14, 8 )
4. Calculate the gradient using m = (y2 - y1) / (x2 - x1)
= (8 - 8 ) / (14 - 3)
= 0
For question 9 matrices:
You should know that multiplying a matrix with its inverse results in the identity matrix. That is: A x A^-1 = I
Hence, we know that B is the inverse of A (vise versa)
So, when a question ever asks if something is true, it's best to try them with actual values. Let's set up some matrices
A = [ 2 3] and A^-1 = B = [-1 0.5]
[6 3] and [3 -1]
Just plug these matrices in each answer and see which one yields the incorrect response