Typos on the Answer Key

For some reason there are negative signs missing from the answer key on the practice test.

#1, 2, 8, 20 are all missing negative signs but they do have a mystery blank space.

Hope it didn't confuse you too much.

Here's a list of topics from the test

Solve by factoring
Solve by taking Squareroots
Solve using the Quadratic formula
Evaluate the discriminant
Solve a quadratic inequality
word problem
translations of graphs
operations with functions
composition of functions = fog
inverse functions
evaluate functions
convert exponential to log form and vis versa
evaluate logs
solve log equations
expand logs and rewrite as single log
solve exponential equations