Try out this test problem first.
Given the variable x as your input, multiply it by twenty and put the result in y.
Input x = 1 Output y is 20 Input x = 2 Output y is 40
The problem statement says to "multiply by ninety", but the problem is clearly to multiply by 20. I think it is a typo.
Matrix indexing with two vectors of indices
Divide by 4
Square a Number
How many days in a month?
Sum 1 to 100 even number
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