if A= [-1 9 2 10 -10 2 -5 6 -5] and B= [7 -1 -1 6 -4 -3 -10 10 -7] Find 2A-4B. PLEASE HELP! THESE ARE CALLED MATRIX OPERATIONS!!!

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?