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Dmitry_Shevchenko [17]
4 years ago
15

There are20 keys on a keychain. One of the keys starts a car. If a key is randomly chosen what is the probability that it starts

the car
A)5% B)25% C)20% D)15%
Mathematics
1 answer:
pogonyaev4 years ago
7 0
The answer is 5%........


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Paul and jose are trying to measure the height of a tree. paul is standing 19m from the foot of the tree and measures the angle
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
Please help! 10 points
Orlov [11]
<h2>Greetings!</h2>

Answer:

Angle A is 118°

Step-by-step explanation:

All angles in a circle add up to 180, so this means that all the measurements of the three angles add to 180:

x + 2x + 13 + x - 8 = 180

Clean it up:

3x + x + x + 13 -8

5x -5 = 180

To isolate the 5x, you need to move the +5 over to the other side, making it a negative 5:

5x = 180 - 5

5x = 175

Now divide each side by 5 to get the value of 1x:

\frac{5x}{5}  = \frac{175}{5}

x = 35

So angle A is:

3x + 13

3(35) + 13 = 118

<h3>So angle A is 118°</h3>
<h2>Hope this helps!</h2>
8 0
3 years ago
Read 2 more answers
Smith has 12 cans of dog food. He has two dogs and gives 2/3 can of food to each dog in a day. For how many days will his dog fo
Amiraneli [1.4K]

Answer:

He has food for 9 days.

Hence, yes he has enough dog food to last one week.

Step-by-step explanation:

8 0
3 years ago
Solve the proportion x+1/3 = x/2<br><br> 5<br> 1<br> 2<br> 10
s344n2d4d5 [400]

Value of x is 2.

Step-by-step explanation:

  • Step 1: Given that x+1/3 = x/2

Cross-multiply to find the value of x.

⇒ 2(x + 1) = 3x

⇒ 2x + 2 = 3x

⇒ x = 2

4 0
3 years ago
What is the volume of the cone with diameter 7in and height 9in? Round to the nearest cubic inch
dezoksy [38]
Diameter = 7 cm
radius = 7÷2 = 3.5
Volume of cone = 1/3 \pi  r^{2} h
Volume of cone = 1/3 \pi 3.5^{2} (9) = 115 cubic inches (Answer B)
8 0
3 years ago
Read 2 more answers
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