Let t=4 and u=6+2i. Find t+u.

One positive number is 9 more than twice another. if their product is 95, find the numbers

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?

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?