Find area of triangle ​

At dinner, 2/5 of the people had fish and 1/3 had chicken. if everyone else had lamb, what fraction of the people had lamb? and if 40 people had lamb , calculate the total number of people at the dinner.

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?