#### Answer

a) 1
b) 1
c) 3
d) 2

#### Work Step by Step

a) Order of the equation is the order of the highest order derivative and that is 1 here.
b) Order of the highest order derivative= 1= order of the equation.
c) This equation involve the highest order derivative of third order. Therefore, the order of this equation is 3.
d) Order of highest order derivative= order of the equation= 2.