exam Maths Puzzle Numerical Ability

write in expanded form using exponents
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exam Other Question

a canoeist paddled for 4 hrs with a 6km/h current to reach a campsite.the return trip against the same current took 10 hrs.find the speed of the canoe in still water. Write the algebraic expression and simplfy. Let x represent the unkown number.
The sum of 5 times a number and -2, added to nine times a number.
I tried 5(x-2)+9x=5x-10+9x=14x-10. There answer was 14x-2. How did they get that?