How many valence electrons does an atom of rubidium have?

Jasmine is diving off a 3-meter springboard. her height in meters above the water when she is x meters horizontally from the end of the board is approximated by the equation h=-x^2+3x+3. what is the maximum height jasmine will reach on her dive?

What is the measurement of how fast an object moves relative to a reference point?

What causes the formation of ocean currents?