book Maths Puzzle Numerical Ability

use the distributive propery to rewrite the expression without parentheses (x+8)10

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Could someone out there help me solve this problem?

Add:
3 h 20 min
4 h 25 min
+ 5 h 35 min

Thanks,
Sher
4x^5+10x^4-16x^2 divide by 4x^2

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