book Maths Puzzle Numerical Ability

What are the foci of the ellipse 4x^2 +13y^2 =52?

What is the equation of the ellipse with the center at (0,0), vertex at (0,5) and co -vertex at (-4,0)?

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I have tried to answer this question until I am more confused than ever. Please help.

3(x-1)+4(2x+1)=11x+1 Solve the following problem and include your steps you use to solve this problem.
A roof truss is in the shape of a triangle with a height of x feet and a base of 2x + 1 feet. Wri