PLEASE HELP At least squares regression line is f(x) = -3.19x + 123.63 and r^2 = 0.59

The strength of the direction is:

A. Very weak

B. Moderately weak

C. Very strong

D. Moderately strong

Hell . what are the solutions to `10x^2 - 38x - 8 = 0`? is this when i find the factors and use the numbers within the factors to determine the zeros? i hope that made sense lol

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?  

15. if the 8% tax on an item amounts to $0.96, what is the final price (tax included) of the item?