The average july rainfall in a city is 7 inches , but the actual rainfall may vary by as much as 4 inches. what is the range , in inches , of the possible rainfall in july?
a) 3 < r < 7
b) 7 < r < 11
c) 3 < r < 11
( all are inclusive i just didn't have the sign for it )

C.

Step-by-step explanation:

Let R represent range, in inches, of the possible rainfall in July.

We have been given that the average July rainfall in a city is 7 inches , but the actual rainfall may vary by as much as 4 inches.

We will use tolerance formula to solve our given problem.

Using absolute value rule , then , we will get:

Therefore, option C represents range, in inches, of the possible rainfall in July.

I already answered this question, if you look back in your questions you should find this answered along with another one. I'll do it again just in case you don't find it.

{y,x} = {-4,-2}

Expanation:

Solve by Substitution :

// Solve equation [1] for the variable  y

 [1]    y = 2x

// Plug this in for variable  y  in equation [2]

  [2]    -2•(2x) - 8x = 24

  [2]     - 12x = 24

// Solve equation [2] for the variable  x

  [2]    12x = - 24

  [2]    x = - 2

// By now we know this much :

   y = 2x

   x = -2

// Use the  x  value to solve for  y

   y = 2(-2) = -4