4. A runner completes two laps around a 400 m track. She runs the first lap in 1 min and 32 s, and the second lap in 1 min and 49 s. What is her average speed?

What is the molar mass of babr2? a. 217.2 g/mol b. 297.1 g/mol c. 354.5 g/mol d. 434.4 g/mol

Iwll give extra points to who gets this for ! what type of reaction is this? ?

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.