The table shows the wavelength of the sound produced by keys on a piano x keys away from the a above middle c.

a 2-column table with 5 rows. the first column is labeled number of keys above the a above middle c with entries 0, 2, 3, 6, 10. the second column is labeled wavelength with entries 78.41, 69.85, 65.93, 55.44, 44.01.

using the exponential regression model, which is the best prediction of the wavelength of the key that is 8 above the a above middle c?

49.31 cm
49.44 cm
49.73 cm
49.78 cm

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

Given that sin∅ = 1/4, 0 < ∅ < π/2, what is the exact value of cos∅? a. (√4)/4 b. (√15)/4 c. (4π)/2 d. (4√2)/4

Oliver had $50 on the day before his birthday. after he recived some money for his birthday , he had $75. write and solve eqaution to find how much money oliver received for his birthday. x+50=75