Im so confused- help please?-

Three times the sum of a number and seven is negative thirty-six. what is the number?

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

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