85% of 252 is what number?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

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 trigonometric ratios sine and secant are reciprocals of each other