- Solve for X: 20 X 2^2x+1 = 640?

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Derivitive of secx? What is the circumference of a circle circumscribed around a rectangle with sides 10 cm and 24 cm? If you are driving along a highway at 1.5m/s^2, how fast are you moving after 20s if you started from rest? 240 x 240's ppi? [Calculus] Can someone explain this asymptotic equivalence please?