Book Maths Puzzle Algebra

1. you can only use four fours to create 65, you can use any mathematical symbol necessary , but you can only use four fours as your digits.
2.find four #'s, the sum of which is

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How do you find the slope of (2,3) (7,6) 1) use four fours to create 65, and you can use any mathematical symbols, but you can only use four fours as your digits.
2) find four #'s, the sum of which is 45, so that if 2 is added to the first #, 2 is subtracted from the second #, the third is multiplied by 2 and the fourth # is divided by 2, then thr four #'s produced are all the same.