Here is me with more issues. Melissa’s birthday is next week and she has been receiving cards in the mail with different amounts of money. She has received five gift cards with the following amounts: $10, $20, $25, $30, and $40. If Melissa receives one more card in the mail with $25, what will the standard deviation do, decrease, increase, or stay the same? The picture is also there!

Really need on these. i have no idea what to do

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

Abank manager wants to encourage new customers to open accounts with principals of at least $2,500. he decides to make a poster advertising a simple interest rate of 3%. what must the principal be if the bank manager also wants to advertise that one can earn $10 the first month? can the poster correctly say, "open an account of $2 comma 500 and earn at least $10 interest in 1 month! "?