Which of the following trinomials can be factored using the square of the difference? NO LINKS!!

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?

Which statement justifies why angle ebc measures 90?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers