Solve and show work l5x + 2l < 12

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

Sara can take no more than 22 pounds of luggage on a trip. her suitcase weighs 112 ounces. how many more pounds can she pack without going over the limit?

Astudent was asked to find the square of 7x+3. the student quickly wrote (7x+3)^3= 49x^2+9. identify the student's error and provide the correct answer.