exam Maths Puzzle Numerical Ability

Use properties of exponents to simplify:
a)100^3/2
b)-9^1/2
c)3^1/2*27^1/2
d)((1/8)^-2)^1/3
e)((121^-1)^-1/2)/22)

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exam Other Question

Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?

Please help me on this
solve for y in each of the following equations

y = xz x = 2, z = 5