9. The average height of 30 boys out of class of 50, is 160cm. If the average T height of remaining boys is 165 cm, find the average height of the whole class
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If a(0,0,0) and b(2,2,2) are points in coordinate space, how many paths are there from a to b that move from one lattice point to another in the positive x-,y- or z- direction?

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression