exam Maths Puzzle Numerical Ability

What's the foci for x^2/9+y^2/25=1

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exam Other Question

solve each systen of equations by using either substitution or elimination.

-r+t=5
-2r+t=4
2 students have 280$altogether.If the first one has 2/5 of the sum of the second one What is the sum of money of each student . PLEASE HELPPPPP!!!!