exam Maths Puzzle Numerical Ability

Please help!
The ellipse:
(x^2/9)+(y^2/16)=1 is which of the following?
1. a vertical ellipse with foci at (0,+-sqrt7)
2. a horizontal ellipse with foci at (+-sqrt7,0)
3. an e

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exam Other Question

Solve the system of equation
5x+y=12
2x=3y-19 Evaluate the functions for the values of x given as 1,2,4,8, and 16. Describe the differences in the rate at which each function changes with increasing values of x.

1. f(x)=l