exam Maths Puzzle Numerical Ability

in how many ways can 5 boys and 3 girls be arranged so that no two girls may sit together?
please help me out?i need this answer today.please please.................

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exam Other Question

What is the minimun and maximum. the vertex, axis of symmetry, and how to graph it. Can you please help me by showing me how to simplify this.

((3x^a y^b)^3/ (-3x^a y^b)^2 )^2

I am not sure if I am writing this properly. The problem is written as a fraction and the entire problem is squared.