. 19 + {(9-4 + (6-21) = (USE BODMAS)

Step-by-step explanation:

19 + {(9-4) + (6-21)} = 19 + {5 + (-15)}

                               = 19 + {5 - 15}

                              = 19 - 10

                              = 9

If this is the equation: 19 + [(9-4) + (6-21], then the answer is 9

Step-by-step explanation:

First step is to deal with the smaller (inner) brackets

9 - 4 = 5

6 - 21 = -15

Then the equation would be 19 + [5 + (-15)]

Next, deal with the larger bracket

5 + (-15) = - 10

The equation would then be 19 + (-10)

Then solve that which gives you 9

step-by-step explanation:

mean or average is 40.6