exam Maths Puzzle Numerical Ability

can anyone help find the slope of the line containing the two given points? A. (5,9);(8,0) m= B. (1,5);(-1,-5) m= C. (0,-4);(3,-3) M= D. (6,4);(11,4) M= I just cant seem to be able to figure these out.

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exam Other Question

P(E)=0.30, P(F)=0.40,P(EnF)=0.1
P(EuF)= Sarah needs to borrow $1500 for her school tuition. She borrows the money on a six month short term note that charges simple interest. After 6 months, she owes $90.00 in interest. What is the simple interest rate being charged on this note?