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# I don't know what I'm doing

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937
1 I'm confused about how to set this up and solve it

Jan 23, 2018

### Best Answer

#1
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temperature   =   f(x)   =   3.8 cos( πx / 20 ) + 2.2

The lowest temperature will occur when  cos( πx / 20 )  is at its lowest value, which is   -1  .

3.8(-1) + 2.2   =   -3.8 + 2.2   =   -1.6

The lowest temperature is  -1.6  degrees Celsius.

Here's a graph:  https://www.desmos.com/calculator/vipm1lflrn

Jan 23, 2018
edited by hectictar  Jan 23, 2018

### 1+0 Answers

#1
+1
Best Answer

temperature   =   f(x)   =   3.8 cos( πx / 20 ) + 2.2

The lowest temperature will occur when  cos( πx / 20 )  is at its lowest value, which is   -1  .

3.8(-1) + 2.2   =   -3.8 + 2.2   =   -1.6

The lowest temperature is  -1.6  degrees Celsius.

Here's a graph:  https://www.desmos.com/calculator/vipm1lflrn

hectictar Jan 23, 2018
edited by hectictar  Jan 23, 2018