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Invaders of the european continent are? What are the principle behind measuring and laying out using tape too long and too short? One number is 2 more than 2 times another. their product is 12. find the numbers? Hello, i have a telescope and I have a lot of questions as to what i should be abke to see with it? The function f is f(x)= (x+4)(x-a), the graph of f is a parabola , a is const. The x coord. is b/w 1 and 3, which is a?
A. -2
B. 1
C. 5
D. 9?