Runner David Time 13.5 Sanya Time16 Jeremy Time 12.6 Erica Time 15.2 Chen Time 12.8 Yusuf Time 11.8 Matt Time 17.2 Sarah 12.1 What is the median in the race

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Is there an x intercept in the equation 60*1.15^x

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota