Search how muCh is a gallon and how much is a quart and these will help you find your answer
Answer:
Step-by-step explanation:
125
75=125*3/5
45=75*3/5
27=45*3/5
8. 3^6
Reasoning because 3^6 gives you 729
Step-by-step explanation:
7-3cosx=9sin²x
[sin²x=1-cos²x]
=>
7-3cosx=9-9cos²x
=>
9cos²x-3cosx-2=0
=>
let cosx=t
9t²-3t-2
by quadratic formula,
t=(3±9)/2·9
=> t=2/3 or t=-1/3
thus,
x=acos(2/3) or x=π- acos(1/3)