Question 208008
Multiply and simplify.
5^16*5^24=5^-8
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5^16*5^24=5^(16+24)
= 5^40
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Divide and simplify. 
(6v)^9 1
(6v)^14 = 6t^5
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If you mean
{{{((6v)^9)/(6v)^14}}}
= {{{(6v)^(9-14)}}}
= {{{(6v)^-5}}} or
= {{{1/(6v)^5}}}
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Multiply.
(y^2-8)(3y^2-6y+4)
=3y^4 - 6y^3 - 20y^2 +48y -32
Looks right to me.