book Maths Puzzle Numerical Ability

How would you figure out a way to write a quadratic function for this following problem:

Participants will travel 25 feet above the water, on a helicopter moving 40 miles per ho

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when given a number of points (i.e 2) the number of lines to join the points is 1. 3 points require 3 lines, 5 points require 10 lines. how would i express this in an algebraic f What is the sequence here? 4,9,19,39,79. Find the next term.