xvxvxv

Do you understand how I opened the brackets  ??

$(3x-3)^2 = 9x^2-18x+9$

$\frac{4}{14} = \frac{2}{7}$

Yes, because -4/0 is infinity 

The line is vertical so the slope is 0 

$ac = 1.5*9.81$

$ac = 14.715 \frac{m}{s^2}$

$v = 20 \frac{m}{s}$

$ac = \frac{v^2}{R}$

$R = \frac{v^2}{ac}$

$R = \frac{20^2}{14.715}$

$R = 27.2 m$

1515.00*(3/100) = 45.45

Do you intersted to explain to you how to solve it by matrices ? 

$x = 2 - \frac{1}{4}$

$x = 1.75$

$\frac{41}{1250}$