book Maths Puzzle Numerical Ability

solve and write in scientific notation: (0.00003 x 10^ 13) (70000)

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book Other Question

I'm having trouble with the following question:

Solve each system by the substitution method. Determine whether the equations are independent, dependent, or inconsistent.

2 what is the radical equation of
square root x+6-square root x-3 = 3