exam Maths Puzzle Numerical Ability

35. solve each systems of equations algebraically

x+8y=0
-x+y=-9

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exam Other Question

How are -1/2cos2x and 1/2sin^2x equal? Or in other words, how do we reconcile the two? if your traveling 120 miles
at 75 miles per hours
EXACTLY how long will it take you to reach your destination?