Need with a math problem

" taylor has a tortilla cart that she uses to sell tortillas at lunch. if i bought two for $9.25 each, how much would it cost me if there was 15% tax added on? "

Just tell me how to set up the equation.

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.

47: 4 aisha changed 1.45 + 2.38 to 1.5 + 2.4 in order to estimate the sum. what estimation method did she use?