How many 7-digit phone numbers can be formed if the first digit cannot be 0 or 1 and if no digit can be repeatd?

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

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.