This data represents the number of movies that were rented each day last week at a-plus video.

124, 121, 135, 128, 146, 159, 153

what is the mean of this data?

Finding the 'mean' means finding the average of all the numbers. so to find the mean add all the values together and then divide by the number of values in the set. so for this set the mean should be 138. Hope this helps! 

For the mean you add them all up and divide by the ammount of numbers you added. So it would be 118

Option D:

y = 2x – 1; y is twice x minus 1.

Solution:

Option A: y = 2x; y is double x

substitute x values in y = 2x, we get

For x = 1, y = 2(1) = 2

so, y = 2x is false.

Option B: y = 3x; y is triple x

substitute x values in y = 3x, we get

For x = 1, y = 3(1) = 3

so, y = 3x is false.

Option C: y = 2x + 1; y is twice x plus 1.

substitute x values in y = 2x + 1, we get

For x = 1, y = 2(1) + 1 = 3

so, y = 2x + 1 is false.

Option D: y = 2x – 1; y is twice x minus 1.

substitute x values in y = 3x, we get

For x = 1, y = 2(1) – 1 = 1

For x = 2, y = 2(2) – 1 = 3

For x = 3, y = 2(3) – 1 = 5

For x = 4, y = 2(4) – 1 = 7

For x = 5, y = 2(5) – 1 = 9

so, y = 2x – 1 is true.

Hence the expression for the table is y = 2x – 1;  y is twice x minus 1.

Each value of y is double that of corresponding value of x, minus 1.