+ 4. A census was conducted to get the total weekly incomes of families in Village A and B an
table below summarised the frequency distribution.
Income (RM)
Number of families
Number of families
in Village A
in Village B
60 to less than 100
5
10
100 to less than 120
45
120 to less than 140
48
25
140 to less than 180
37
41
180 to less than 240
12
34
Calculate the mean and standard deviation of weekly income in Village A and Village B

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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false

step-by-step explanation:

rulers and compasses arent required in order to bisect an angle because when bisecting angles, you're making a "half circle" and considering in order to bisect an angle it wouldn't be straight, you wouldn't need either of the two

this answer is !