How do you explain mental math to multiple two numbers

What are the values of each variable in the diagram below?

Select the correct answer from each drop-down menu. consider the following polynomials equations. 3x^2(x-1) and -3x^3+ 4x^2-2x+1 perform each operation and determine if the result is a polynomial. is the result of a + b a polynomial? yes or no is the result of a - b a polynomial? yes or no is the result of a · b a polynomial? yes or no

Siri can type 90 words in 40 minutes about how many words would you expect her to type in 10 minutes at this rate