exam Maths Puzzle Numerical Ability

The Computer Club invested $2200, part at 4.5% interest and the rest at 7%. The total annual interest earned was $144. How much was invested at each rate?
How do I set up this problem?

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exam Other Question
Determine whether each of the following is a trinomial square.
1. x^2-14x + 49
2. x^2-10x - 25
3. 36x^2-24x+16
4. 16x^2-40xy+25y^2
5. 9x^2 - 36x + 24

Can someone please help? Thank you!! Please help.
log base3(x-2)+log base3(x+4)=3
e^x+5=8