Add the difference between 2 ⅞ and 1 ¾ to the product of ¼ and 2 ½ . then divide the answer by 1 ¾. what is the final answer?

What term makes it inconsistent y=2x - 4

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¯¯¯¯¯¯¯¯)?

Which best explains why this triangle is or is not a right triangle ?