URGENT PLEASE HELP: 1 - 2 cos^2r = - sin^2r - 1

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Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

One month, a music site observed that 60% of the people who downloaded songs from its site downloaded q sam's latest single. the equation below represents this information, where x represents the total number of people who ddownloaded songs from the site that month: x = 0.6x + 384 how many people who downloaded songs from the site that month downloaded q sam's latest single?

Which of the following transformations will always produce a congruent figure?