Why is it best not to perform multiple t tests on the same data?

Omega Restaurant received an invoice dated July 22 from Industrial Kitchen Equipment for $3691, with terms 2/10, 1/20, n/45. Omega made payments of $1,100 on August 1, $900 on August 10, and $800 on August 31. What amount was still owed on September 1?

Here are some summary statistics for last year's basketball team scoring output: lowest $\text{ score }=18$ points, $\text{ mean }=58$ points, $\text{ median }=52$ points, $\text{ range }=97$ points, $\mathrm{IQR}=46$ $\mathrm{Q}1=23\text{, }$ standard $\text{ deviation }=9$ points.Suppose the opponents' scoring output was 10% lower.Find the opponents' mean and standard deviation.

A) Mean: 52.2 points,SD: 8.1 points
B) Mean: 52.2 points,SD: 9 points
C) Mean: 63.8 points,SD: 9.9 points
D) Mean: 63.8 points,SD: 9 points
E) Mean: 5.8 points,SD: 0.9 points

It is possible to have a statistically significant result that is NOT meaningful.

An investor bought a 5 ½% bond at 99. Compute the current yield. (Round answer to two decimal places.)

Determine if $x=3$ is a solution to $|x-3|>5$ .

A) $x=3$ is not a solution.
B) $x=3$ is a solution.