exam Maths Puzzle Numerical Ability

Determine whether the statement is a tautology, self-contradiction or neither

(p ^ ~q) -> q

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exam Other Question

crystal sells coffee. her special blend is a combination of french roast @ $7.50 a lb. and kona deluxe @ $11.50 a lb. how many pounds of kona should she mix with 12 lbs. of french roast to get a blend to be sold for $10.00 a lb.? Sketch the graph of each equation:

(a) y = 2x
(b) y = x + 1
(c) y = -x + 3
(d) y = 2x + 1
(e) y = -3x -2
(f) y = 2/3x + 1
(g) y = 3/4x + 1
(h) y = -4x