9°, complementary angles always add up to 90°
The answer is 12 because hk crosses hl and L is right in the middle of hk which equals 24 and half 24 equals 12
since l is half of hk the answer has to be 12
19 comes next in the series, followed by two 21s.
Look at the slope in each equation. A neg. slope indicates that the function is decreasing. A pos. slope: increasing.
