Find the value of r so the line that passes through (–5, 2) and (3, r) has a slope of -1/2

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school. each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220

Solve the equation for x. 50(4x + 12) = 200

Brad earns $12.75/hr and works 40 hours a week. what is his gross annual income?