Juan tells you that your work in Excel will go a lot faster if you start using defined names instead of cell and range addresses. You believe him but you have been frustrated by defined names in the past because you did not know the rules for naming them and you have run into errors as a result. Juan offers to help you. Which of the following is true statement Juan can make about defined names as he is explaining the rules to you?
A) The name can include letters, numbers, periods, and underscores
B) To distinguish multiword names, use a hyphen between the words
C) Defined names are case sensitive
D) All of the above

In a heat transfer course, we can derive the equation for the temperature distribution in a flat rectangular plate. in this example, we will look at a plate at steadystate with three sides being held at t1, and one side held at t2. the temperature for any location on the plate, t(x,y), can be calculated by where create a function (prob3_5) that will take inputs of vectors x and y in feet, scalar n, scalars l and w in feet and scalars t1 and t2 in degrees fahrenheit. it will output a matrix t which is the temperature of each x and y locations. t will have the number of columns equal to the number of elements in x and rows equal to the number of elements in y. though this can be done without loops (perhaps more efficiently), your program must use a nested loop.