Answer:
16.2 foot shadow
Step-by-step explanation:
Let the shadow cast by 27 foot tree be x.
Using ratio and proportions,
18 / 30 = x / 27
(18 x 27) / 30 = x
x = 486 / 30
x = 16.2
Answer:

Step-by-step explanation:
we know that
<u><em>Combinations</em></u> are a way to calculate the total outcomes of an event where order of the outcomes does not matter.
To calculate combinations, we will use the formula

where
n represents the total number of items
r represents the number of items being chosen at a time.
In this problem

substitute

simplify



Step-by-step explanation:
First term (a) = 21
common difference (d) = 14-21= -7
general equation for nth term = a+(n-1)d
The 38th term of the AP= 21+(38-1)(-7)
= 21+(37)(-7)
= 21 −259= −238
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