What would be the first step according to our order of operations?

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 of the following shows the length of the third side, in inches, of the triangle below

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?