y=kx
30 = k* 6
so k=5
so y = 5x
when x= 12
y = 5*12 =60
ZERO solutions
4x+5 = 9+4x subtract 4x from BOTH sides
5=9 this obviously is not true....no solutions
Amplitude will be ONE because there is no multiplier in front of cos 4x
period will be 1/4 of original = pi/2
20000(1.08^t) = growth
1700(.93^t) = decay
If the object of the exponent > 1 it is growth
if object of the exponent is a fraction between 0 and 1 it is decay
Does that help?
You're welcome.....
Coc(2x) = 1 x = pi or 0 (and 2pi)
Yes....62.87 is correct
-sqrt2 +2 = 2 - sqrt2 Third choice
2 cos = 1
cos (x ) = 1/2
ARCOS(X) = x = arcos(1/2) = 60 degrees or 300 degrees ( pi/3 radians or 5pi/6 radians)
2 (-sqrt2/2) - 4 (-1/2) = -sqrt 2 +2
