Please I need help with #2

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

The quadratic function h(t)=-16.1t^2+150 choose the graph representation

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