Select all that apply.<--- Zack is taking a test in which he answers questions at a rate of question per minute. If Q represents questions and M represents minutes, which of the following equations describe this rate relationship?

M = 2 × Q
Q = 2 × M
M = × Q
Q = × M

Because of your favorite lemonade it is $3.84 for 3 gallons. write this as an unit rate

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

Gia opened two savings accounts at two different banks. one account earns an annual 3.4% simple interest, and the other earns half as much. if she deposited $500 in each account, how much total interest will she have earned in 5 years? a. $34.00 b. $25.50 c. $51.00 d. $510.00