Joanne sells silk-screened t-shirts at community festivals and craft fairs. her marginal cost to produce one t-shirt is $ 5.50 . her total cost to produce 70 t-shirts is $ 435 comma and she sells them for $9 each. a. find the linear cost function for joanne's t-shirt production. b. how many t-shirts must she produce and sell in order to break even? c. how many t-shirts must she produce and sell to make a profit of $800?

Percent increase and decrease. original number: 45 new number: 18

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.