Graph y= 3x+4 Please help! 8th grade math

John bought 2 horses at rs 20000 each

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¯¯¯¯¯¯¯¯)?

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x