Help.

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

Consider the sequence below. 3 , 1 , 1/3 , 1/9 , select the explicit function which defines the sequence.

Asap will give brainiest to first person to answer what is the measure of angle b in the triangle? enter your answer in the box.m∠b=