Asked by Althea

the function of y= 0.81t^2 relates the time t in seconds, that it takes a problem of length y, in feet, to swing back and forth one time. about how long would it take a 3- ft pendulum to swing back and forth one time? round to the nearest tenth.
Answered by Althea
Can someone please help me? :(( I badly need it now :(((
Answered by Steve
what, you can't just plug in the number and find t?

0.81t^2 = 3
t^2 = 3/.81 = 3.7037
t = 1.9245
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