exam Maths Puzzle Numerical Ability

Sorry I did not give you the whole problem.
0.12 = 8 x 1/2^t/153
must solve for t

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exam Other Question

For f(x) = 1/x^2 -2x -8, find the interval(s) where f(x) < 0.

possible answers:
(-4,2)
(-2,4)
(2,4)
(2,8)

Pleeze show me. Thank you. a shot put champion release that shot from 6ft above the ground.The path of the ahot is modeled by H(d)=-2d^2=1.1=c
how far does the shot travel before it hits the ground