After falling 23°F the temperature is now 51°F what was the starting temperature

74 degrees

Step-by-step explanation:

You would have to add the starting point to the current temperature.(51+23=74)

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.