4.9t²=20,t=?0.8t²=20 t=?

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4.9t²=20,t=?0.8t²=20t=?4.9t²=20,t=?0.8t²=20t=?4.9t²=20,t=?0.8t²=20t=?4

4.9t²=20,t=?0.8t²=20 t=?
4.9t²=20,t=?0.8t²=20 t=?

4.9t²=20,t=?0.8t²=20 t=?
4.9t²=20,t^2=200/49,t=±10√2/7
0.8t²=20 ,t^2=200/8=25,t=±5