Jonny cut a plank of wood so that it is 50% shorter. It is now 42cm long.

How long was the plank of wood before Jonny cut it?

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

The verbal translation for the difference of m and 7 increased by 15

Asap i need it now choose all the answers that apply. sex-linked disorders affect males more than females affect females more than males can be carried by females, without being expressed are always expressed in males are caused by genes carried on the x and y chromosomes