heyy! can someone please help with all these questions:(( i don’t know it and it would be really nice if u helped!!! and please don’t make these excuses saying “where’s the picture” and “I can’t read what it says it’s too blurry” because I really work hard for these points :) so please don’t let me down, thank you so much and I hope you have the greatest day<33 stay safe and stay healthy! / I will post this non stop because no one is helping and just keep taking points away from me :( /

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."

a             it is the sum of the initial amount and the additional amount after d days.

step-by-step explanation: