Express each of the following vertex form into general form and intercept form.

a) f(x)=(x-2)²-1
b) f(x)=9-(2x-1)²
c) f(x)=2(x+1)²-18

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

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

There are a total sales of 2,000 dollars on monday on tuesday sales dropped 10% on wednesday sales dropped another 20% compared with tuesday from wednesday to thursday sales increases by an equal amount to 25% of monday total sales what is the net change in dollars on total sales from monday to tuesday