What is the missing value in the data set that would make the mean equal 80? show your work or explain how you got your answer. {71, 91, 82, 90, 88, 61, 70, __ }

all the numbers have to equal 640

because mean is add the all up and devide by how many. Theres 8 numbers and times that by 80 to get 640

so add them all up

71

91

82

90

88

61

70

553

subtract 640 by 553

youre answer is 87

  y= -3x is the required function.

step-by-step explanation:

we have been given a table:

x             y

0             0

1             -3

3             -9

-2             6

we can see that the values of y is -3 times the value of x

hence, the function would be: y= -3x.

put the values of x will give the same y as in the table that means function is satisfying the given table.