When traveling at a fixed speed, the distance traveled varies directly to the time traveled. What is the constant of variation for a train that traveled 200 miles in 4 hours.

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¯¯¯¯¯¯¯¯)?

Can someone pls ! pls answer all. no explanation needed..

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!