The RANGE of the function f is A) [1,3]
B) {1,2,3}
C) {A, B,C, D,E}
D {(A,2), (B,1), (C,3), (D,2), (E,2)}​

Can someone explain the elimination method to me for this problem?

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

Which of the following could be the ratio of the length of the longer leg 30-60-90 triangle to the length of its hypotenuse? check all that apply. a. 313 6 b. 3: 215 c. 18: 13 d. 1: 13 e. 13: 2 of. 3: 15