Plese asap pleses im really confused, need some onn thats skilled

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4

What is the slope of the line? a. -5/2 b.2/5 c. 5/2 d.7/2

Recall that two angles are complementary if the sum of their measures is? 90°. find the measures of two complementary angles if one angle is twenty dash nine times the other angle.