Aperson weighs 100 pounds. a dog weighs 5 times less. how much does the dog weigh?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

The high temp today was 62°. when nighttime comes, the temp will drop 40°. by 4am the temp will drop an additional 40°. what is the temp at 4am?

The angle of elevation from point a to the top of the cliff is 38 degrees. if point a is 80 feet from the base of the cliff , how high is the cliff ?