What is the sum of the first 30 terms of this arithmetic sequence?
6,13, 20, 27, 34, ...

Aladder that is 30 ft long needs to reach 27 ft up a building. what should the angle of the vertical be?

Evaluate cos2θ for cosθ = square root of 3/2

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point