What does the r value (correlation coefficient) represent

That is the relationship of data, If it is close to 1 they are closely related if its closer to 0 there is almost no relationship, If it is negative, there is a downward slope if it is itll  have an upward slope

Step-by-step explanation:

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk