JamesBriggs2011 wrote:if someone can explain how to do these it would be appreciated

That's what the Purplemath lessons are for!

JamesBriggs2011 wrote:(sqrt3-sqrt8)(sqrt3+sqrt8)=?

9sqrt75-6sqrt3=?

(sqrt2+1)(3sqrt2+1)=?

sqrt6(sqrt5-sqrt7)=?

To learn how to simplify added and multiplied square-root expressions like these, try

this lesson.

JamesBriggs2011 wrote:sqrt(x+10)=-9 x=? or is there no solution?

To learn how to solve radical equations, try

this lesson.

JamesBriggs2011 wrote:(sqr(6mn))to the ninth, rewrite with rqtional exponents

sqrt(9x^)=?

To learn how to work with rational powers, try

this page and

this page.