book Maths Puzzle Numerical Ability

Graph:
x squared + y squared < 16
y < x

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book Other Question

What interest will you pay on a $8100 loan for 1 year if the interest rate is 15%?
im really dumb and i have looked at the percentages and deciamls to percentages etc and stil cant figure any of it out. i need this explained to me like im a toddler
thanks