The length of the rectangle is 3x+5y and the width is 2x+y determine the perimeter of the rectangle

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

From the beginning of the day the temperature rose 15 degrees so that by 4 pm it was 87 degrees. what was the temperature at the start of the day

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4