exam Maths Puzzle Numerical Ability

both sides of a parallelogram measure 8cm and 10 cm between them and form an angle of 120 degrees. calculate the lenght of their diagonal

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exam Other Question

I've been giving the following problem:

If 2f(x)+f(1-x)=x^2 find f(x)

The answer was given as:

1/3x^2+2/3x-1/3

I need to know how this answer came about. I have two Sunrise Sand and Gravel charges $4.50 for each cubic yarrd of sand plus $6.00 to deliver the sand. How much sand would they deliver for $100.00?