Edward uses x = 10 and y = 40 to find the initial value. What is his mistake?

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

Find the common ratio of the sequence. -4, 8, -16, 32, a: -12b: -2c: 12d: -1/-2

You have 37 coins that are nickels, dimes, and pennies. the total value of the coins is $1.55. there are twice as many pennies as dimes. find the number of each type of coin in the bank.