Too many clues are given in the Solution Template.
Also, Problem Statement is inconsistent with Test Suite (and Solution Template). It should say: "Create a function that subtracts b from a" (not "a from b").
Back to basics 7 - Equal NaNs
Convert a vector into a number
Area of an Isoceles Triangle
Find index of a string in a cell array
Persistence will not help you solve this problem.
How do you make seven even?
Translate German decimals to English decimals
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