Ahot air balloon begins its descent at a rate of 22 1/2 feet per minute. how long will it take for the balloons elevation to change by -315?

4. a spring scale is constructed so that each 0.10-n increment is separated by 0.50 cm. what spring constant is necessary for the scale to be accurate? -1.0n/cm -0.10n/cm -9.8 n/cm -0.20n/cm

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?