exam Maths Puzzle Numerical Ability

How do I simplify 8r^2(r+8)-3r(5r^2-11)-9(3r^2-8r+1)

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exam Other Question

I have been asked to carry out the arithmetic opertaion to subtract the following complex numbers:

(9+j7)-(12-j)

Would appriciate some help, thanks. 22 STUDENTS HAVE CHARTERED A BUS TO TRAVEL TO THE CHAMPIONSHIP GAME AND WILL SPLIT THE COST EQUALLY. aFTER 17 OF THE STUDENTS HAVE TURNED IN THEIR SHARE, $131.75 HAS BEEN COLLECTED. What is the cost of chartering the bus?