Help pls due tddd

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¯¯¯¯¯¯¯¯)?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.