Can you pls help? This is a multiple choice, and including the answer can u add a one sentence explanation on why? Tysm! I’ll give 29 points

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

Solve: 3x+y=6 4x-2y=18 show all work !

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.