Which one of the following points satisfies both inequalities? 2y<x-3, x+3y ≤7 a) (5,0) b) (5,1) c) (7,2), d) (8,3)
a) (5,0)
In a number with at least two digits, the last digit was deleted. The resulting number was n times smaller than the previous one. Which is the greatest possible value of n? a) 10 b) 11 c) 19 d) 20
c) 19
In approximately 240 BC, the Greek mathematician Eratosthenes estimated the circumference of the Earth to be 44,100 km. In fact, the circumference fo the Earth is 40,075 km. What was the percentage error in the estimate given by Eratosthene
10.0%
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