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Rectangle:

Area = width x length

hence area = 4cm x 2.5cm

area = 10cm² 

Circle: 

Area = pi x radius²

Radiu...

Our given equation is d²x/dt² + 5dx/dt + 6x = 0, which we need to recognise as a second order differential equation. Therefore we need to begin by solving the auxilary funtion m^...

y= x³ +5x² -6x +4

dy/dx = 3x² +10x -6

...

dy/dx = 3x^2

First, if the question does not already have one, draw a diagram. 

Area of a rectangle is base * height and area of a triangle is 1/2 * base * height. As the two areas are the same, you know you ca...