Which equation is equivalent to 4s=f+2

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 t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?