landon bought 4 pounds of walnuts for 10.92. what is the constant of proportionality that relates the cost in dollars y to the number of pounds of walnuts x

What does x = in this equation x+3+2x=x+5

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?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?