I am a three digit number. I am greater than 312 but less than 348. The digit in my tens place equals 5+2. The sum of my digits is 18. What number am I?

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

What are the sotions to the quadratic equation 9x^2=4

Kayla has a $500 budget for the school party.she paid $150 for the decorations.food will cost $5.50 per student. what inequality represents the number of students,s, that can attend the party?