Shay buys and sells seashells at the seashore. shay buys purple seashells for $3 each, brown seashells for $2 each and shimmering seashells for $6 each. she sells the purple seashells for $4.50 each, the brown seashells for 3.75 each, and the shimmering seashells for $7 each. use the distributive property to write a numerical expression to represent shay's total profit

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.

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items