When david emptied the collection canister of his vacuum cleaner, he found nickels and quarters among the other of the canister. when he counted the coins, he found that the number of quarters he counted was three less than number of nickels he counted. he has 21 coins in all.

he has 9 quarters and 12 nickles.

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation:

47 - 90 = 43

43 - 180 = x

x = 137