What is the cost in dollars for each phone

Find the given elements if matrix d:

Select the graph of the solution. click until the correct graph appears. |x| = 3

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50