The product of -41·(-1) is 41.
41 times 1 equals 41. With there being two negative integers in this equation, you will come out with a positive because negative + negative = positive.
For B, You can use properties of multiplication to find the product by adding the the second number the amount of times that it says. For example in 3•4 you have to do this 3+3+3+3.
