I need to get these problems answered but I have a lot on my plate plz do this for me this one time

Question

4. 5√7•3√3 5. 4√6•2√6 6. 2√x•3√x 7. 5√y•√y 8. -3√3z^12•6√12z^3 9. (2√3-√2)(3√3+√2) 10. (√5-√3)(2√5+4√3)

Answer 1

????????? yu agin ????????

5*sqrt(7)*3*sqrt(3)=15*sqrt(21)

=15*4.58257569495584

=68.7386354243376

Answer 2

4. The product of square roots is the square root of the product, so square root of 7 times square root of 3 is the same as square root of 7*3. The answer is 5*3*sqrt(21)=15sqrt(21)=68.74 approx.

5. Sqrt(6)*sqrt(6)=6, so answer is 4*2*6=48.

6. 6x.

7. 5y.

8. sqrt(3)*sqrt(12)=sqrt(36)=6. z^12*z^3=z^15. Answer: -18*6*z^15=-108z^15.

9. Expand the brackets:  (2sqrt(3)*(3sqrt(3))+(2sqrt(3)(sqrt(2))-(sqrt(2))(3sqrt(3))-2=

(6*3)+2sqrt(6)-3sqrt(6)-2=(18-2)-sqrt(6)=16-sqrt(6)=13.55 approx.

10. 2*5+4sqrt(15)-2sqrt(15)-12=2sqrt(15)-2=5.75 approx.