exam Maths Puzzle Numerical Ability

Two numbers have a sum of 39. Their difference is 11. What are the two numbers? Yes this is third grade math.

Read Solution (Total 0)

exam Other Question

Prove that if and B are square martices and AB is invertible, then both A and B are invertible.
i am not sure where to start. I know that because it is a proof you can't use an e Calculate the value of the discriminant of x^2+4x+4=0 ,By examining the sign of the discriminant in part a, how many x-intercepts would the graph of y=x^2+4x=4 have? Why?