Answer:
a = 7.4
b = 9.6
Step-by-step explanation:
set up a proportion to find 'b':
XN / NY = MN / NO
8/b = 13/(b+6)
cross-multiply:
13b = 8(b+6)
13b = 8b + 48
5b = 48
b = 9.6
set up a proportion to find 'a':
XN / XY = MN / MO
8/a = 13/12
cross-multiply:
13a = 96
a ≈ 7.4
The first thing you should do for this case is find the amount that Michael has traveled.
For this we have to multiply the distance to the store and the percentage traveled.
We have then:
(3/8) * (4/5) = 12/40
Simplifying we have:
(12/40) * ((1/2) / (1/2)) = (6/20) * ((1/2) / (1/2)) = 3/10
answer
Michael has walked 3 / 10Km (80% of the way to the store)
Answer:
z = 10
Step-by-step explanation:
The value of the z-statistic is given by:
In which:
X is the measured value.
is the expected value.
is the standard deviation of the sample. 
is the standard deviation of the population.
In this question:
The mean length was 2.9 inches, and the population standard deviation is 0.1 inch.
This means that 
Random sample of 100 screws.
This means that n = 100.
To see if the batch of screws has a significantly different mean length from 3 inches, what would the value of the z-test statistic be?
3 inches, so 
Answer:
the difference is 36
Step-by-step explanation:
what is the base and the height, your question isn't full. I'll answer this after I get this information ;)
