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Sure

ill see what i can do

\[\sqrt{81x^5/3x}\]
my answer was \[9x^2\sqrt{3}\]

3x-[5-4(2x-7)]
my answer was x-7

For the first one, 81/3 = 27 so...your answer to that one needs some adjusting

The second one is correct

Ya the second one is all good!

\[\Large \sqrt{\frac{ 81x^5 }{ 3x}} = \sqrt {27 x^4} = \sqrt { 9*3 x^4}\]

so the first answer is...\[3x^2\sqrt{3}\]

\[\sqrt{16x^2}\] x\[\sqrt{3x^3}\]
my answer was \[4x^2\sqrt{3x}\]

\[45x ^{7}y ^{4}z\]\[\div 9x ^{2}y ^{8}z ^{4}\]
my answer was \[5x ^{5}\div y ^{4}z ^{3}\]

Q: \[45x^7y^4z÷9x^2y^8z^4\]
A: \[\frac{ 5x^5 }{ y^4z^3 }\]

Seems right.