Match the one-to-one functions with their inverse functions.
inverse function
f^-1(x)=4(20-x)< >
f^-1(x)=x-7< >
f^-1(x)=8(x+7)< >
f^-1(x)=-3(x-1)< >

function
f(x)=x/8-7
f(x)=x+7
f(x)=1-x/3
f(x)=20-0.25x

What is the number 321,000,000 in scientific notation? also what is the number? ?

Ten members of balin's soccer team ran warm ups for practice. each member ran the same distance. their combined distance was 5/6 of a mile. to find the distance that each member ran, balin wrote the expression below.

(50 ) mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.