book Maths Puzzle Numerical Ability

The question is Find five points that satisfy the equation 4-x=y. Graph them on a coordinate plane and describe the geometric figure they suggest. I have had only one day of adva

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Suppose the number of students in a mathmatics class is X , the teacher insists that each student participate in group work each class. The number of possible groups is G = x^2 - 3 Explain the process and show EACH step in the process of simplifying the following problems:
a. sqrt13 � sqrt5
b. sqrt5 � sqrt7 � sqrt3
c. sqrt3(sqrt3 + sqrt5)