Given f(x)=5/2x+7,if f(x)=-13 find x

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.

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents