book Maths Puzzle Numerical Ability

please help me in this question......

2.8*10^4+3.2*10^5

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book Other Question

Find the equation of the line joining the points
(─5, 2, 3) and (5, ─ 2, 3).
please help me in this question....
10^6 -2.5*10^-1*10^-6