Amienatta has 20 coins in her piggy bank, all dimes and quarters. The total amount of money is $3.05. How many of each coin does she have? Which problem below is the correct system of equation to match this situation is d= number of times and q= number of quarters. d + q = 20
0.10d + 0.25q = 3.05

d + q = 3.05
0.10d + 0.25q = 20

d + q = 20
0.25d + 0.10q = 3.05

d + q = 3.05
0.25d + 0.10q = 20

Which of the following is not a subset of {1,2,3}?

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.