Hyvää on! Mistä häiriöstä?
B: Isn't that what you did in A? Don't forget
given the following set of data where x represents the number of items sold and y(x) represents the profit when x items are sold
X # of items Y(profit)
for letter A i already got the answer the quadratic formula which is y=-50x+600x+350
B. create a specific algebraic model for profit as a function of the number of items sold.show your work and clearly define variables
C. the break-even point is when profit is zero. what is/are the break even points?explain your answer
Did you mean ? Otherwise f(0) isn't correct nor is it a quadratic as you've written it.
Cancel out a factor of 50 to make this simpler to solve and move everything to the other side (you don't have to do either of these but I prefer having positive a)
Solve using your favourite method (I get and as solutions)
If you have a perfect model, which you do, the chart or the equation will do just fine. Since this is a quadratic model, there will be another zero for somewhere x > 7. You will have to decide if this is a valid result. Is the model defined for x > 7? Perhaps only 7 can be produced?