exam Maths Puzzle Numerical Ability

I^-1 =

a. 0
b. I
c. 1
d. You cannot find the inverse of this matrix

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exam Other Question

Factor: st + 5b � bs � 5t
A) (s � 5)(t + b)
B) (s � 5)(t � b)
C) (s + 5)(t � b)
D) The expression is prime. Is there an easy way to find the slope of a line whose function is stated as an inequality of y=m+b? For example: 5(x+y)=20+3x How would this be put into y=mx+b form?