exam Maths Puzzle Numerical Ability

The formula for calculating the amount of money returned for an initial deposit money into a bank account or CD (Certificate of Deposit) is given by A=P(1+r/n)nt

A is the amoun

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exam Other Question

(3+4 radical sign 6)(-5-2 radical sign 6) Please help me simplify.
I came up with -63-26 radical sign 6
Can someone tell me if this is correct or where I went wrong? an airplane travels at N 62 E at 400m/h there is a 20mph wind due west what is the acual speed of the plane