Old account balance
transaction
amount
new
account balance
account 1
352
-48
304
account 2
432
a
512
account 3
75
-100
b
account 4
С
52
12
account 5
-10
-20
-30
Explain what each of the numbers -10, -20, and -30 tells you about Account 5.

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

I’m really confused and need your assist me with this question i’ve never been taught