Write an equation of the parabola in vertex form. Passes through (8, 3) and has vertex (4, -1), Please help me out im so lost in these type of problems

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

The tree filled 3/4 of a cup in 1/2 and hour at what rate does syurup flow from the tree

Moesha is (3g+1) years old and shanti is twice moesha age. find the sum of the ages of moesha and shanti in 2 years time. how old will shanti be when moeshas age in twice her present age? find how old moesha and shanti were 4 years ago if g= 5