book Maths Puzzle Numerical Ability

(2sqrt5)(3 sqrt15)

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book Other Question

If $1000 is invested at 7.5% compounded annually, find the future value that results in 30 years to the nearest $1. The center of a circle is (-4,7)and one endpoint of a diameter is (2,-1). What is the other endpoint of the diameter?
a.(6,15)
b.(-10,16)
c.(-6,13)
d.(-10,15)
thanks for your help!