Can someone help me with this ASAP I’ll give you brainlist if I got it correct

What is the ratio of the change in y-values to the change in x-values for this function? a) 1: 13 b) 2: 5 c) 5: 2 d) 13: 1

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319

What is the geometric mean of 3 and 7? a) square root of 21 b) 2 square root of 6 c) 2 square root of 7 d) 21