When given a correlation coefficient of 0.788, what is the percent of variation for this situation?

question 2 options:

0.788

0.621

0.762

0.678

question 3
the function f(x) varies directly with x and f(x) = 12 when x = ¼.

what is f(x) when x = 1/8?

question 3 options:

6

48

12

24

question 4 (1 point)
the function f(x) varies inversely with x and f(x) = 25 when x = 6.

what is f(x) when x = 18?

question 4 options:

150

75/3

25

25/3

question 5 (1 point)
a subway pass as a starting value of $75. after one ride, the value of the pass is $72.50. after two rides, its value is $70. after three rides, its value is $67.50. write an explicit formula to represent the remaining value on the card as an arithmetic sequence.

what is the value of the pass after 15 rides?

question 5 options:

$40

$42.50

$2.50

$37.50

will give brainliest, 99 points