exam Maths Puzzle Numerical Ability

Find the point of intersection for the following lines:

2x+y=13

and

x-y+2

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exam Other Question

The number of bacteria present in a culture after t minutes is given as B=100e^kt.If there are 6028 bacteria present after 12 minutes,what is k? Find the value of c that completes the square.
y to the second power - 3y+ c