Help. Stuck with maths.?

The formula for the shape of the St Louis Arch is



y = 757 - 127.7cosh(x/127.7)



y and x are measured in feet.



Find y for the value of 165Help. Stuck with maths.?
y = 757 - 127.7cosh(x/127.7)

whenx=165

y =y = 757 - 127.7cosh(165/127.7)

or y= 757 - 127.7cosh(1.292)

y= 757 鈭?127.7{ e^1.292+e^(鈭?.292)}/2 since coshx ={ e^x+e^(鈭抶)}/2

Therefore y = 507.43 ft
idk, plz someone help me with mine...



if p=3i - j find the unit vector in the direction of p and the magnitude and direction of pHelp. Stuck with maths.?
Do you mean find y when x = 165?