4 Write an expression in simplest form that represents the perimeter of the rectangle shown below.
Show your work on the scratchpad.
2x - 1
3x + 2

1. during first 10 seconds 2. between 10 seconds and 35 seconds 3. during 35 seconds to 40 seconds

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

If the value of cos330°is√3/2 then find cos 165°.