Given the following information for hypothesis tests of a population mean, determine the appropriate critical value(s) t

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Given the following information for hypothesis tests of a
population mean, determine the appropriate critical value(s) that
would lead to the rejection of the null hypothesis Ho in favor of
the alternative hypothesis Ha. Remember to correctly denote
positive/negative values (i.e., +/-).
Solve the following based on the above
(Ho: u = 85; Ha: u < 85; N = 35; α = .01) Critical value(s)=
____________
(Ho: u = 85; Ha: u > 85; N = 20; α = .05) Critical value(s)=
____________
(Ho: u = 85; Ha: u ≠ 85; N = ∞; α = .05) Critical value(s)=
_____________
(Ho: u = 85; Ha: u ≠ 85; N = 20; α = .05) Critical value(s)=
____________