exam Maths Puzzle Numerical Ability

this is in algrebra 1 prentice hall mathematics book in chapter 5 section 4
i want to write a function rule to the cost in dollars of painting dollar bills when it costs 3.8 cent to print a dollar bill

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exam Other Question

find the equation of the line with slope 7 and y-intercept(0,-15). Write your answer in slope-intercept form. Identify the axis of symmetry, create a suitable table of values, then sketch the graph (including the axis of symmetry).
y=-x^2+3x-3

Wow, do I really need help. Thank you!