Foathe square root of \( 10+2 \sqrt{21} \)

5. If the area of a rectangle is \( x^{2}-x-6 \) sq. units and its length is \( (x-3) \) units, then its breadth is \( \begin{array}{llll}\text { a. }(x-2) \text { units } & \text { b. }(x+3) \text { units } & \text { c. }(x+2) \text { units } & \text { d. }(x-3) \text { units }\end{array} \)

B. \( \frac{25 a^{4} b^{2}}{15 a^{4}}= \)

a. \( 6(4-z)=2 z \)

1. If \( \mathbf{A}=[1,2,3] \) and \( \mathbf{B}=[4,5,6] \), what is \( \mathbf{A}+\mathbf{B} \) ?

e. \( \frac{14 x^{4} y^{7}}{16 x y^{7}}=7 x \)