What is the value of 3 times 10 to the negative 5th power

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.

Consider the function f(x)=-5x+3 what is f(-2)

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).