Answer:12.5
Explanation: Divide 50$ by the 4 hours and you will get 12.5 which is $12.50.
Answer:
Area is 0.08504
and
are needed for polishing
Explanation:
(a) ft is unit of F.P.S system whether mm is unit of M.K.S system.
According to unit conversion, 
So, 
hence, 
So, area of telescope lens is 0.08504
(b)
are polished in 45s
So,
are polished in
or 
Formula M1V1 =M2V2
1.5 * 100 = M2 *300
M2 = 1.5*100/300= 0.5.
Answer: the molarity is 0.5M.
Mole ratios<span> are important because mole ratios allow you change moles of a substance to moles of another substance.</span>