PLEASE HELP. PLEASE DO NOT SPAM OR ADD USELESS ANSWERS TO GET THE POINTS YOU WILL BE REPORTED. I WILL MARK BRAINLIEST What is the exact value of ?

Use one of these formulas in the screenshot below (THESE ARE NOT ANSWER CHOICES)

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¯¯¯¯¯¯¯¯)?

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

What is the equation of the line that is parallel to the line with the equation y= -3/4x +1 and passes through the point (12,-12)