In a jar are 113 coins—all quarters, nickels, and pennies. The number of pennies is seven less than the sum of the number of quarters and nickels. The total value of the coins is $8.13. Find the number of quarters, the number of nickels, and the number pennies.

1. there are 25 students who started computer programming in elementary school and 25 students who started computer programming in middle school. the first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%. the line plot shows the differences after 10 rerandomizations. determine whether the difference in the means of the two groups is significant based on the line plot. explain your answer.

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.