Use sigma notation to represent the sum of the first six terms of the following sequence: 4, 12, 20,
a] 6 over ∑ (n = 1) -4 + 8n
b] 6 over ∑ (n = 1) 4 + 8n (i think it is "b",
c] 6 over ∑ (n = 1) -1 + 8n
d] 6 over ∑ (n = 1) 1 + 8n

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Iam trying to solve a linear equation for the shoe size of someone 84" tall taking into consideration example 1 is 69" tall with a shoe size of 9 and example 2 is 72 inches tall with a shoe size of 11. i understand that the equation should be y=mx+b and that on the graph the answer is (3,2) but i just don't understand how to create the equation to solve for 84-inches and 60-inches tall questions. after two days, i need .

Choose the number sentence that shows the identity property of addition. a. 122 = 61 + 61 b. 62 = 1 + 61 c. 61 = 0 + 61