exam Maths Puzzle Numerical Ability

If there are 17 different ingredients for a burrito, how many different combinations can be made? How many years would it take to try all the combinations?

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exam Other Question

1-(1+xy^-2)^-2 divided by 1+(1+xy^-2)^-2

Directions are to simplify. Thanks
A line passing through (-4,4) and (x,-8) is perpendicular to a line with slope 5/12. Find the value of x.