Ihave a two expressions 3z-4 and 2z+5

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.

Solve this problem! extra ! 3025/5.5 = a/90.75

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585