Question
Find the value of 1 unit.
  1. 7 u + 10 = 640
  2. 10 + 7 u = 640
  3. 6 u - 80 = 280
  4. 280 = 6 u - 80
4 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

(c)

Click button first when a symbol is required. X

(d)

Click button first when a symbol is required. X

Find the value of 1 unit.
  1. 7 u + 10 = 640
  2. 10 + 7 u = 640
  3. 6 u - 80 = 280
  4. 280 = 6 u - 80