What the answer for cos (-270)

An environmentalist wants to compare the pH levels in lakes near the west coast of the United States to lakes near the east coast of the United States. They sample water from 5 randomly selected lakes from each population of lakes.

Y-31=12, y is 42 what is the answer for this problem

What is the arc length if theta = 7 pi over 4 and the radius is 5?

Find two consecutive even integers such that the smaller added to threetimes the larger gives a sum of 30.

What are the 6 multiples of 2/5

What is the greatest common factor of 60 84 24

it takes the earth 24 hours to complete a full rotation. It take the sun approximately 25 days, nine hours, and seven minutes to complete a full rotation. How many hours does it take the sun to complete a full rotation?

you need 418 yards of blue silk to make one bridesmaid's dress and 358 yards of the same fabric to make another. How many yards of blue silk do you need to make both dresses?

What is the answer to x/3-9=-5

One of the highest snowfall rates ever recorded was in silver lake, colorado, in april 1921, when just over 7 feet of snow fell in 27.5 hours. what was the rate in inches per hour