2. a. given two sets s = {w, x, y, z} and t = {%,^,* and a function : s → t defined as follows: f(w) = %, f(x) =^, f(y) = *, f(z) = %. determine if f is one-to-one and onto. [2 marks) find f - if it exists; otherwise give a reason why it does not exist. [1 mark] b. derive a formula for the sum of the first positive odd integers, [3 marks)

Peaches cost $4.29 per pound. find the cost of two and a quarter pounds of peaches.

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

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?