y-x^2/xy x x/1+xy
2^a + 2^b = 640, a+b = ?
$\sqrt{\ 162}$/x=x $\sqrt{18}$
6(91)-(21)2
6(433)-(21)(108)
6(91)-(21) $a^{b}$ 2
find the square of (a+b)2 by using diagram method
6x+5=3x-13
∂u/∂x+∂v/∂y+∂w/∂z=0
use the table of cubes to evaluate 23.5^3