For what values of r will the area of the shaded region be greater than or equal to 12 square units? Write your answer as an inequality.

Need on this one asap im almost done with this subject

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.

Compare the cost of the bike trips from the two companies shown.for both the cost in a linear function of the number of days which statements is true