A toothpaste advertises that 30% of stains are removed after 1 week. As Alexa is brushing her teeth, she thinks "after 2 weeks, 60% of stains will be gone, and 90% after three weeks". Using this reasoning, what percent of stains will be gone after four weeks? Does this result make sense? Why or why not?

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

Two language majors, anna and megan, took exams in two languages. anna scored 85 on both exams. megan scored 74 on the first exam and 85 on the second exam. overall, student scores on the first exam had a mean of 82 and a standard deviation of 4, and the second exam scores had a mean of 71 and a standard deviation of 13. a) to qualify for language honors, a major must maintain at least an 85 average across all language courses taken. so far, which of anna and megan qualify? b) which student's overall performance was better?

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the