The lowest temperature ever recorded on Earth was $-89.2\degree\text{C}$ −89.2°C at Soviet Vostok Station in Antarctica. The highest temperature ever recorded was $56.7\degree\text{C}$ 56.7°C at Greenland Ranch in California. What is the difference between the highest and lowest recorded temperatures?

Which shows the image of rectangle abcd after the rotation (x, y) → (–y, x)?

Factor this polynomial completely x^2-64

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?