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15. Jennifer is preparing for a golf tournament
by practising her putting. So far she has
been successful on 10 out of 31 putts.
a) If she tries x putts from now on and she is
successful on half of them, what equation
represents A, her overall average putting
success rate as a function of x?
b) Use a graphical approach to determine
how many putts it will take before her
average is up to 40%.