find the general solution of the following equations.
a. 2y′′−3y′=0
b. y′′+6y′+9y=0
c. y′′+8y′+25y=0
d. y(4)−8y′′+16y=0
e. 9y′′′+12y′′+4y′=0
f. y(3)+y′′−y′−y=0

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.