exam Maths Puzzle Numerical Ability

two ships leave a harbor traveling on courses that have an angle of 120 degrees between them. if they each travel 515 miles how far apart are they (to the nearest mile)?

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exam Other Question

9. A box contains four defective and six good electronic sensors. If five sensors are drawn, with replacement,
find the probability of drawing
(a) at most one defective
(b) at least one defective
(c) fewer than three defective Graph y= 2x^2-7