How to prove it's an identity
sin y + sin 3y + sin 5y + sin 7y = 4 cos y cos 2y sin 4y

Common binomial factor of 6x(3x+7)+5(3x+7)

Someone answer this asap for gabriella uses the current exchange rate to write the function, h(x), where x is the number of u. s. dollars and h(x) is the number of euros, the european union currency. she checks the rate and finds that h(100) = 7.5. which statement best describes what h(100) = 75 signifies? a. gabriella averages 7.5 u. s. dollars for every 100 euros. b. gabriella averages 100 u. s. dollars for every 25 euros. c. gabriella can exchange 75 u. s. dollars for 100 euros. d. gabriella can exchange 100 u. s. dollars for 75 euros.

The measure of angle theta is 3 pi over 2. the measure of its reference angle is pi /