What is the domain of 1/square root of x-1

Find the values of y: 3y^3(y^2+ 2/3y)=0

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?