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V125BC [204]
3 years ago
13

Two small planes leave Sacramento and LA, which are 380 miles apart, and travel toward each other. If one plane travels 30 miles

per hour faster than the other one and they meet in an hour, what are their respective speeds?
Mathematics
1 answer:
Anettt [7]3 years ago
7 0
The sum of their speeds is 380 miles per hour. The difference of their speeds is 30 miles per hour. Then the faster plane is traveling at
.. (380 +30)/2 = 205 miles per hour

The slower plane's speed is 30 miles per hour less, so it is traveling at
.. 205 mph -30 mph = 175 miles per hour
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Nina [5.8K]
The firts thig we are going to do is create tow triangles using the angles of elevation of Paul and Jose. Since the problem is not giving us their height we'll assume that the horizontal line of sight of both of them coincide with the base of the tree.
We know that Paul is 19m from the base of the tree and its elevation angle to the top of the tree is 59°. We also know that the elevation angle of Jose and the top of the tree is 43°, but we don't know the distance between Paul of Jose, so lets label that distance as x.
Now we can build a right triangle between Paul and the tree and another one between Jose and the tree as shown in the figure. Lets use cosine to find h in Paul's trianlge:
cos(59)= \frac{19}{h}
h= \frac{19}{cos(59)}
h=36.9
Now we can use the law of sines to find the distance x between Paul and Jose:
\frac{sin(43)}{36.9} = \frac{sin(16)}{x}
x= \frac{36.9sin(16)}{sin(43)}
x=14.9

Now that we know the distance between Paul and Jose, the only thing left is add that distance to the distance from Paul and the base of the tree:
19m+14.9=33.9m

We can conclude that Jose is 33.9m from the base of the tree.

3 0
3 years ago
Twice the sum of a number and 5 equals 9 as a equation
ziro4ka [17]
Hello!

I believe it looks like this..

2*x+5=9

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Hope this helps! ☺♥
7 0
3 years ago
Which angles are linear pairs? Check all that apply.
AlexFokin [52]
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The measure of a straight angle is 180 degrees, so a linear pair<span> of angles must add up to 180 degrees.
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Answer:

c

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4 0
3 years ago
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stiv31 [10]

Answer:

m = - 1

Step-by-step explanation:

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\frac{15m+3}{2} = - 6

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m = - 1

6 0
2 years ago
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