Please help me it math

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation

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.