Joannie lent $200 to her sister. Four years later, her sister repaid her in full with $228. What simple annual interest rate did Joannie's sister pay? A 3.0
B. 3.5
C.4.0
D.4.5

pls hurry im timed

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Im literally having a mental breakdown

Select the graph of the solution. click until the correct graph appears. |x| = 3