exam Maths Puzzle Numerical Ability

Convert the rectangular point (-8,8sqrt3) to polar coordinates with r>0.
Also give two additional ways to represent this point in polar coordinates
for which r<0 and -2pi0 and -2pi

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exam Other Question

The rate of compound interest at which a sum of Rs. 8000 amounts to Rs. 8820 in 2 years, is:
Option 1 : 5% Option 2 : 4% Option 3 : 6% Option 4 : 7%
Option 5 :
None of
these
Can you help me subtract the expression? PLEASE!!

2/5w+10 - 3/2w-4

Thank you! These are sooo confusing!