exam Maths Puzzle Numerical Ability

Simplify: (d/d^2-9)+(5/2d+6).

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exam Other Question

The Acme Plumbing Company will send a team of 3 plumbers to work on a certain job. The company has 4 experienced plumbers and 4 trainees. If a team consists of 1 experienced plumber and 2 trainees, how many different such teams are possible? Triangles ABC and DEF are similar
AB=5.0 cm
BC=6.0 cm
AC=7.0 cm
If triangle DEF has a perimeter of 360 degrees find the length of the sides of ABC