Answer:
C. Figure out how much you need, then comparison shop using the Web and other resources.
Step-by-step explanation:
Answer:
C) 4tan34
Step-by-step explanation:
TOA
tan(x) = Opposite/Adjacent
Opposite the angle, adjacent meaning next to the angle
sub in values
tan(34) = x/4
multiply each side by 4
x = 4tan(34)
There's your answer.
You have the correct approximate value of k. The part after that is where things get a bit strange.
You don't plug in t = 5 again. We don't know the value of t yet. We're trying to solve for it.
We do know u(t) is 135 as we want the temperature to be 135 degrees. Plug this in and isolate t.
So
u(t) = 70+380e^(-0.1004183888t)
135 = 70+380e^(-0.1004183888t)
135-70 = 380e^(-0.1004183888t)
65 = 380e^(-0.1004183888t)
380e^(-0.1004183888t) = 65
e^(-0.1004183888t) = 65/380
e^(-0.1004183888t) = 13/76
-0.1004183888t = ln(13/76)
-0.1004183888t = -1.7657839828248
t = -1.7657839828248/(-0.1004183888)
t = 17.5842692152893
So it takes about 17.58 minutes for the item to cool to the desired temp
Answer:
i think you had it on the point
Step-by-step explanation:
