Help me.........................

1.
[tex] = 30 + 20 \sqrt{3} - 12 \sqrt{3} - 24 \\ = 6 + 8 \sqrt{3} [/tex]

2. log(45) = log(9 \times 5) = log( {3}^{2} ) + log(5) = {x}^{2} + y
3.
[tex] = \frac{16 {x}^{6} {y}^{4} {z}^{2} }{16x {y}^{4} {z}^{2} } \\ = {x}^{5} [/tex]
4. 3(3) x 4(¼)= 9