Why are both multiplication and addition used in the equation that represents Cole’s monthly payments?

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

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

Which polygon is she in the process of constructing ?