Find the critical value zα/2 that corresponds to a 98% confidence level.

A critical value is the point on the scale of the test statistic (z test in this case) outside which we reject the null hypothesis, and is taken from the level of significance of the test. The critical values can be obtained from the standard distribution tables for z and for this case, it is equivalent to:

critical value zα/2 at 98% confidence level = 2.326

2.326

drop him sis he’s not worth your precious time

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value