exam Maths Puzzle Numerical Ability

Explain permutations and combinations and the difference between the two. Use examples to illustrate.

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exam Other Question

The femur of a 37-year old woman measured 47.9 cm. Use a calculator to find the height of the woman to the nearest tenth of a centimeter; using h=61.412 + 2.317F; F=47.9cm Title of book: Glencoe Algebra 1(Integration, Applications, Connections) Can someone please help me with this problem??
Simplify the expression; assume that all the variables represent positive numbers.
(625x^4y)^1/4
______________
(16xy^3)3/4

Thank You so much