Which unit rate is equivalent to 15 miles per gallon?

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¯¯¯¯¯¯¯¯)?

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

How many 2/5s are in 1 and 1/2 plz someone me right now