exam Maths Puzzle Numerical Ability

How would you write an equation in standard form for an ellipse with foci(5,0)and (-5,0) and y- intercepts of 7 and -7?

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exam Other Question
Solve for x: logbase9 x=-1/2 The sum of two numbers is 80. The larger number is 8 less than 3 times the smaller number. find the smaller number