Aviation Math.
 

An aeroplane cruising at FL 350 in ISA conditions commences its descent and holds Mach 0.76 to an altitude where its speed is 300KIAS at which point the pilot selects airspeed hold for the remainder of the descent. Using a plot of True Airspeed at altitudes between top of descent and 20,000 ft determine the altitude where Mach Number and Indicated Airspeed correspond. Show all calculations and assumptions.

Currently:

Mach Number = TAS / a

Than all I have to do is repeat this from 35,000ft to 25,000

That will give me my first linear line. However, the issue I'm now having is plotting my next points to find to get the intersection. Help appreciated!

Try this thread

http://www.pprune.org/professional-p...-ias-help.html