+33661 1f:
$$$$\frac{c^2d^4}{c^4d^2}\frac{c^6d}{(cd)^2}=\frac{c^8d^5}{c^6d^4}=c^{8-6}d^{5-4}=c^2d$$$$
6a:
$$$$z=\frac{3-xy}{2}$$
Multiply both sides by 2 $$2z=3-xy$$
Add xy to both sides $$xy+2z=3$$
Subtract 2z from both sides $$xy=3-2z$$
Divide both sides by y$$x=\frac{3-2z}{y}$$
Now let's see your attempt at some of them.
+33661 1f:
$$$$\frac{c^2d^4}{c^4d^2}\frac{c^6d}{(cd)^2}=\frac{c^8d^5}{c^6d^4}=c^{8-6}d^{5-4}=c^2d$$$$
6a:
$$$$z=\frac{3-xy}{2}$$
Multiply both sides by 2 $$2z=3-xy$$
Add xy to both sides $$xy+2z=3$$
Subtract 2z from both sides $$xy=3-2z$$
Divide both sides by y$$x=\frac{3-2z}{y}$$
Now let's see your attempt at some of them.
