10minutes= 10/60 hours
= 1/6 hrs
speed = distance/ time
=3/ (1/6)
= 18 km/h
Answer:
General solution is

Step-by-step explanation:
<u><em>Step(i):-</em></u>
Given cos x - sin x = √2 cos (3 x)
Dividing '√2' on both sides , we get

we will use trigonometry formulas
a) Cos ( A + B) = Cos A Cos B - sin A sin B
b) 
<u><em>Step(ii):-</em></u>
<u><em></em></u>
<u><em></em></u>


<u><em>Step(iii):-</em></u>
<u><em>General solution of cos x = cos ∝ is x = 2 nπ+∝</em></u>
<u><em>we have </em></u> 
The general solution of
is
⇒ 
⇒ 

<em><u>final answer</u></em>:-
General solution is

Answer:$24 on 2016
Step-by-step explanation:
2012 = $30
2015 = $25.50
30.00-25.50=4.50
$4.50
so,3 years different, so that 4.50/3 years = $ 1.50