exam Maths Puzzle Numerical Ability

Coefficients are to ____ as exponents are to ____?

I believe it terms and factors..

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exam Other Question

sorry i cant seem to figure this one out
SOLVE FOR X

0.1x-0.01(10-x)+0.01(100-x)=19

Thanks ALOT
A plane flies 300 miles with a tail wind in 1 hour. It takes the same plane 2 hours to fly
the 300 miles when flying against the wind. What is the plane’s speed in still air?