#30 The exponent should be x2-3 instead of x2-3.
In the third paragraph and the left hand side of the first equation, several occurrences of y and t should be replaced with Δy and Δt. (Look for the blank spaces.)
#3 The correct answer is 50 ergs (not 200 ergs).
#1 Insert a minus sign in the exponent.
I'm sure there are others I have missed. If you find any, please pass them along.
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