Z=7f/r+4 , solve for r

              7f

     r =  -  4

                z

Step-by-step explanation:

I will assume that you meant:

         7f

z =

        r + 4

Solve for r.  Start by interchanging z and (r + 4):

               7f

r + 4 =

                z

Now subtract 4 from both sides.  This isolates r:

              7f

     r = - 4

                z

the thermometer is precise but not accurate

step-by-step explanation:

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,