exam
Maths Puzzle
Numerical Ability
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.
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exam Other Question
Lucy is 4 times as old as Amy. Three years ago, Lucy was 13 times as old as Amy. How old is Lucy now?
I^-1 =
a. 0
b. I
c. 1
d. You cannot find the inverse of this matrix