exam Maths Puzzle Numerical Ability

please help with a few problems

-[12 + (3)]

|-5 + 12 | + ( -7)

-|-11+6|

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exam Other Question

how do you simlpify (7 x 10^7)(5 x 10^-5) then write it in scientific notation? I really need some help with this one.

The height h in feet of an object after t seconds is given by the function

h= 16t^2 + 70t + 8

HOw long will it take the object to hit the ground? Round your answers to the nearest thousandth.