book Maths Puzzle Numerical Ability

Jake paid $100.70 including 6% tax for a color printer. How much did the printer itself cost? please write this as a algebra problem.

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simplify the square root of 157 the question is:
graph the info by drawing tf in the y axis and tc in the x axis and plot the information on freezing and boiling temps as points on the graph.
and it gives us a