Suppose y varies directly with x write a direct variation equation that relates x and y when y =6 and x=12 then find the value of y and x=10

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?