exam Maths Puzzle Numerical Ability

solve the system of equation 3y+2z=12 and y-z=9.

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exam Other Question

the winner of a race ran the distance in 45s at an average speed of 9.6m/s. the runner who came in last finished in 48s what was the last runners average speed?

THX ALOT can you help me express in simplest form

x^2/
over
x+10
plus
9x-10
over
x+10