Can someone help me out with problem (CALCULUS I) problem is attached below
I am giving 100 points to anyone who does it. Its only one problem multiple choice but I need work to understand how to solve it.

Arandom variable x has a mean of 10 and a standard deviation of 3. if each value of x is multiplied by 2, what will the new mean and standard deviation be?

In 2009, florida suffered more fatalities than any other state. a. bicyclist b. child passenger c. pedestrian d. impaired driving

Which of the following situations would most likely occur if a human-induced event caused the ocean water to become the same temperature around the world? deep ocean current circulation would increase salt distribution around the world's oceans. surface ocean current circulation would distribute heat around land masses at a faster rate. new, fresher water would float on top of dense salt water and limit thermohaline circulation. some land masses in the northern hemisphere would start to warm up over time, melting snow and ice. runoff of surface freshwaters and rainfall would no longer have an effect on the salinity of ocean waters.