Here's my go at it:

1.

2.

3.

First, find the interception point between 1. and 2. using simultanous equation, then find the interception point between 1. and 3. Use the lowest number co-ordinates

Integrate and solve the equation 1. using the interception points as your upper and lower. Call this area A.

(I used the numbers closest to 0 as that is their central area of interception)

This comes to:

Find the interception point between 2. and 3. and use your previous point of 1. and 2. interception point.

Integrate and solve the equation using the interception points as your upper and lower. Call this area B.

(I used the numbers closest to 0 as that is their central area)

This comes to:

Add A and B. This is the area under the porabolas 1. and 2.

For porabola 3. use the same interception points, not 0.

Minus the porabola 3. area from A and B's total area: