Ramona used the regression equation y = 444x - 21.29, ramona determined that her answer was incorrect

where x represents height and y represents shoe size, to because a man who is -17.52 inches tall does not

predict the approximate height of a man who wears a

make any sense. what was ramona's mistake?

size 8.5 shoe

she substituted the 8.5 for the wrong variable.

1. y = 444(8.5) - 21.29

she should have added 444 and 8.5.

2 y = 3.774 - 21.29

the value for y should be positive.

3 y=-17.52

the solution of -17.52 should be the shoe size

Step-by-step explanation:

The 8.5 refer to shoes size, not height. So, replacing 8.5 for the x-variable is wrong, because x refers to height and y represents shoe size.

Therefore, Ramon just substituted the 8.5 for the wrong variable. She must replace 8.5 for y-variable, because that's the right one for shoe size.

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6