exam Maths Puzzle Numerical Ability

Find the greatest common factor of

8c3rd power dw5th power - 10c6th power d2nd power w10th power.

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exam Other Question

Can you help me? I tried to do it myself, but I have no idea if it is correct. Calculate the simple interest earned. Round to the nearest cent.
P= $4,000, r= 8.4%, t= 33 days

M
simplify:

i(5+i)