statistics question on Sample Size and Power

Attached document has question. Will need to download G power for this. G*Power: Statistical Power Analyses for Windows and Mac.
Using G*Power to Determine Sample Size (5:16/YouTube)Links to an external site.
Effect Size for Independent Samples t-Test (2:24/YouTube)Links to an external site.
What is statistical power (8:21/YouTube)Links to an external site.