Using the Sine Rule:-
20 /sin 45 = BC / sin 30
BC = 20 sin 30 / sin45
= 20 * 1/2 / 1 / sqrt2
= 20 * 1/2 * sqrt2
= 10 sqrt2 answer
4 (3n-2) is the answer.
Woops. Sorry I had no idea that it said expression (s) instead of expression, but that is one of the answers though.
Answer:
1.90 2.6
Step-by-step explanation:
Answer:
The correct answer is "$159 and $175".
Step-by-step explanation:
The give values are:
Mean,
= $167
Standard deviation,
= $40
Number of commuters,
n = 100
Now,
⇒ 
On putting the given values, we get
⇒ 
⇒ 
⇒ 
By using the 2 SE rule of thumb, we get
= 
= 
=
($)
Or,
= 
= 
=
($)
i.e,
$159 and $175