book
Maths Puzzle
Numerical Ability
Use Cramers rule to solve the equation
4x+8y=12
3x+6y=9
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book Other Question
find an equation of the ellipse having the given points as foci and the given number as sum of focal radii.
(-9,0);(9,0);30
one of these is it: x^2/15 + y^2/12 =1 or x^2/225 + y^2/144 =1
or x^2/15 - y^2/12 = 1
On a trip Jennifer noticed that her car averaged 21 mi/gal of gas except for the days she used the air conditioning, and then it averaged only 17 mi/gal. If she used 91 gal of gas