Which shows the rational expression written using the least common denominator? +1
+
23
20N – 21
+
+1
2x
* +1
(-2)
+1
+
2 x - 2)
*+1
+
123
23

Multiply −2x(6x^4−7x^2+x−5) express the answer in standard form. enter your answer in the box.

Ineed in figuring out this problem.

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?