Wich of these is not a sign of chemical change 1 a gas is given off
2 the material dissolves.
3 a color change occurs.

2. The material dissolves

The Question tests the understanding of chemical change and whether we know the signs that show its occurrence.

First we need to know what is chemical change;

Second we need to identify the signs that indicate the occurrence of a chemical change

d

explanation:

i think the answer is d. but im not sure!

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .