A helicopter flies 168 miles against the wind in 2 hours; with the wind, it can
fly 252 miles...
Mathematics, 27.03.2020 01:54 hermine40
A helicopter flies 168 miles against the wind in 2 hours; with the wind, it can
fly 252 miles in the same amount of time. Find the speed of the helicopter in still air.
Answers: 2
Mathematics, 21.06.2019 17:30
25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.
Answers: 1
Mathematics, 21.06.2019 19:30
Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?
Answers: 1
Mathematics, 21.06.2019 19:50
Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .
Answers: 3
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