Add the following expressions. a. 2a+b and 3a+4b-c

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

Nasa scientists must work together to make sure that everything is correct and accounted for when launching a shuttle. besides a physicist, what other type of scientist would be in making sure that the shuttle has the appropriate type and amount of fuel to reach its destination?

What is a dendrite and what does it do?