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brilliants [131]
3 years ago
10

PLEASE HELP WOULD REALLY APPRECIATE ITWrite the number in standard form: 9.1×10^-9

Mathematics
1 answer:
MrMuchimi3 years ago
5 0

Answer:

0.0000000091

..............

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A person that is 5 feet tall casts a shadow 25 feet long. How long is the shadow of a tree that is 15 feet tall?
fiasKO [112]
The person and his shadow make a right triangle as well as the tree and it's shadow. they will be similar right triangles containing angles that are equal. I'm in similar triangles the angles are proportional so a ratio could be used to determine the shadow length. this ratio is:
25/5 = x/15
(Notice that both the height of the person and
the height of the tree height of the tree are on
the bottom because these would be similar
sides and the same for the shadows with both
on top. this could easily have been switched
with the shadows on bottom and heights on
top like:
5/25 = 15/x
however I noticed the 25/5 could easily be
reduced. this eliminated the need for cross
multiplication.)

The 25/5 can be reduced to 5:
5 = x/15
and then multiply both sides by 15 and you get:
x = 75
so the answer is 75 feet long.

this can be checked various ways. using trigonometry we have the opposite and adjacent sides so tangent could be used to find the angle between the shadow and the hypotenuse. this is:
tan (x) = opposite/adjacent
opposite = height
adjacent = shadow
so:
tan (x) = 5/25 for person
tan (x) = 15/75 for tree
these equations both reduce to:
tan (x) = 1/5
And of both equations are the same then the angLee are equal creating similar triangles and a correct answer
4 0
3 years ago
The value of 5 in 506712 is how many times the value of 5 in 324859
Oxana [17]
It is 1.55 times the value of the second number. 
8 0
3 years ago
Read 2 more answers
Find the sum of (x+5), (-4x-2), and (2x-1)
RideAnS [48]
I think the answer is -x+2.
3 0
3 years ago
3 divided by 74 in partial quotient form
eimsori [14]
The answer would 0.0405
6 0
2 years ago
15 point reward + brainliest for the CORRECT answer
Misha Larkins [42]

Answer:

2/ 15

Step-by-step explanation:

since the probability is 16/ 120
then we simplify it till it gets 2/15

hope this helps
and good luck!

6 0
2 years ago
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