A jar contains only pennies, nickels, dimes, and quarters. There are 16 pennies, 18 dimes, and 28 quarters. The rest of the coins are nickels. There are 84 coins in all. How many of the coins are not nickels? If n represents the number of nickels in the jar, what equation could you use to find n?

Find the slope of a line given the following two points

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

Which of the following parabolas opens down?