Paul says that a lower unit rate is better value only if you can use all the items purchased to get the lower unit rate. Do you agree? Explain

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0