exam Maths Puzzle Numerical Ability

Write the equation of the line passing through (7,4) and (14,12)

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exam Other Question

THE AMOUNT OF A RADIOACTIVE TRACER REMAINING AFTER t DAYS IS GIVEN BY A=Aoe^0.18t, WHERE Ao IS THE STARTING AMOUNT AT THE BEGINNING OF THE TIME PERIOD. HOW MUCH SHOULD BE ACQUIRED NOW TO HAVE 40 GRAMS REMAINING AFTER 3 DAYS? I have a word problem....The product of three and a number decreased by seven is seventeen. What is the number? I need to formulate an equation. I wish word problem made since to me. Thank you