Two sides of a trapezoidal are 25 meters. the third side is 40 meters. the fourth side is 20 meters shorter than the longest side. what is the perimeter? explain.

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¯¯¯¯¯¯¯¯)?

Need solving this second acceleration problem.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5