exam Maths Puzzle Numerical Ability

Think of a real-life situation that can be represented by a exponential function; translate the situation to the function and solve the function and represent it graphically?

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exam Other Question

Find the values (if any exist) that make the rational expression undefined.

-2x-4
-2x+4 This is supposed to be a fraction but I can't get the underline under
-2x-4. 4x+5y=5
8x+10y=10
I need to solve this using elimination
* I know I need to solve for x and use that answer in the next equation, but not sure what one I have to start with. Your help is appreciated.