exam Maths Puzzle Numerical Ability

WORD PROBLEM:

How much water should be added to 8 ML of 6% Saline solution to reduce the concentration to 4%?

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exam Other Question

What are the values of the indices i and j for the element that is in the fifth column and fourth row?


a. 4, 5, respectively
b. 5, 4, respectively
c. Either 4, 5 or 5, 4; they are interchangeable
d. There are no elements in matrices
how do I graph 2y+5x=-2

I came up with (0,-1) and (-2/5,0) but do not know if it is correct and if so how to graph