The graph shows the cost per day of electricity over a seven-day period. what type of correlation is shown? a. negative b. no correlation c. positive

A. Negative. You’re welcome

From the given diagram we can see that, on an average, as the variable x increases, the variable y decreases.

We also know that Negative correlation is a relationship between two variables in which one variable increases as the other decreases, and vice versa.

Thus, from the above two paragraphs it is clear that the graph which shows the cost per day of electricity over a seven-day period, presents, on an average, a Negative Correlation the dependent and the independent variables.

The area of a rectangle is calculated by multiplying the dimensions (length and width). if we let the width be w, the length, which is 4 ft longer than the width will be represented as w+4.

(a) the quadratic equation that would best represent the given is,
                  (w)(w + 4) = 525
                                w² + 4w = 525 or w² + 4w - 525 = 0
(b) solving for the values of w in the quadratic equation,
                                  w = 21 and w = -25
thus, we take w as 21 and w+4 = 25. the dimensions of the floor are therefore 21ft and 25 ft.