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These questions are just a matter of extracting the information and putting it into an algebraic equation.
1A)
Your data set contains 5 numbers: {91, 86, 73, 79, and x}
x = the score on the last test.
We want this equation to equal 400, the minimum number of...

Just plug in the x values.
So,
a) f(13) = (13)^2 - 13
= 169 - 13
= 156
b) f(a) = a^2 - 13

a = 1
When doing any math problems, one must follow the law of operations: P.E.M.D.A.S.
P = Parentheses
E = Exponents
M = Multiplication
D = Division
A= Addition
S = Subtraction
So..
2(a+7) - 7 = 9
(2...