Which system models the given situation? Darnell has quarters and nickels that total $20. There are a total of 100 coins. o A. x + y = 20
.25x + .05y = 100
o B. X+ y = 20
25x + .50y = 100
O C. X + y = 100
.25x +.05y = 20
O D. x + y = 100
.25x +.5y = 20

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?