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a teacher drew a number line on the board and named some points on it. The teacher then asked the class to list all the rays in the figure. A student answered 30 rays in all and the teacher said it was correct. How many pointswere named in the figured?

Sagot :

the formula in finding number of rays is 2(n-1) where n is the number of points

2(n-1)=30
2n-2=30
2n=30+2
2n=32
n=16