Can you show me how to convert the polar equation into a rectangular equation?

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

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