Gary wants to by a computer that costs $645. he earns about $10 an hour at his new job after taxes are deducted from his paycheck. how many hours does he have to work before he can buy the computer? include units and in answer. do not round

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.