PLEASE HELP ASAP 3. JRod is trying to get a cart to reach the wall at the end of the system pictured below. She uses a ramp to get the cart some energy to cover that distance. However, as shown below, using the ramp as constructed, she was not able to reach the wall. a. What can Jrod change to get the cart to reach the wall? b. Explain how you know.​

How do you know how many valence electrons an atom has?

Elements that have one valence electron and are very reactive are called

The average atmospheric pressure on earth is approximated as a function of altitude by the relation patm = 101.325 (1 − 0.02256z)5.256, where patm is the atmospheric pressure in kpa, and z is the altitude in km with z = 0 at sea level. determine the approximate atmospheric pressures at atlanta (z = 306 m), denver (z = 1610 m), mexico city (z = 2309 m), and the top of mount everest (z = 8848 m).