The lengths of salamanders have a normal distribution with mean 15cm, and standard deviation 2cm. What proportion of salamanders are between 11 and 15 cm long?

Which graph correctly shows the system of equations {y=12x+2y=−12x+6?

What is the main social system that existed in ancient china?

How does the supremacy clause of the u.s. constitution affect the states? o a. it requires each state to establish a supreme court. b. it declares that the federal government can take away state powers if necessary. o c. it allows state governments to overthrow the federal government if necessary. o d. it ensures that the u.s. constitution overrules each state constitution