Let u = 5i - 4j and v=4i + 2j. decompose u into two vectors u, and u,, where u, is parallel to v and u, is orthogonal to v.
write your answers in the form ai+bj.

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¯¯¯¯¯¯¯¯)?