What is .87 rounded to the nearest hundred in decimal form?

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

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.