exam Maths Puzzle Numerical Ability

Okay, I said one more question, but I've been working on this final problem and I'm still stumped. The question is: Given the following polynomial identify the end behavior, the

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exam Other Question

WHEN x NUMBER OF UNITS ARE SOLD, THE PRICE OF EACH UNIT (IN DOLLARS) IS GIVEN BY

p = -x/2 + 75. FIND THE UNIT PRICE WHEN THE FOLLOWING QUANITIES ARE SOLD:

2, 7, 9, 11.

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JMS A grocer buys walnuts for $0.45/lb. and pecans for $0.60/lb. If the nuts must be combined for a 90 lb. mix worth $0.55/lb, how many pounds of walnuts must be added?