exam Maths Puzzle Numerical Ability

Is this one correct?

8*10^6

=80^6

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exam Other Question

Is -22 a:
Natural Number
Real Number
Interger
Rational Number
Irrational Number
Real Number

My answer: real number,whole number and an interger I have tried 3 different algebra tutors, to no answer. Suppose a cost benefit model is given by y= 2845 over 100-x . Where y is the cost for removing x percent of a given a pollutant can be removed for $23,000? Choices are: 114.1%, 89%, 8.9%, 447%