If x=12 What is the value of the expression2(x)+3

Mathematics

1 answer:

GaryK [48]2 years ago

7 0

Answer:

147

Step-by-step explanation:

2(X)= (X) x (X)

12 x 12 + 3= 144+3=147

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Brandon sights a helicopter above a building that is 200 feet away at an angle of elevation of 30 degrees. To the nearest foot,

Firlakuza [10]

The problem says that <span>Brandon sights a helicopter above a building that is 200 feet away at an angle of elevation of 30 degrees. So, you can calculate the height asked, by following this procedure:
</span>
Tan(α)=Opposite leg/Adjacent leg

α=30°
Opposite leg=x
Adjacent leg=200 feet

When you substitute these values into the formula above (Tan(α)=Opposite leg/Adjacent leg), you have:

Tan(α)=Opposite leg/Adjacent leg
Tan(30°)=x/200

You must clear "x":

x=200xTan(30°)

Therefore, the value of "x" is:

x=115 feet
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How high above the ground the is the helicopter?

The answer is: 115 feet</span>

4 0

3 years ago

The radius of the aluminum (Al) atom is 143 pm. The radius of the aluminum ion (Al3+) is 54 pm. By what percentage did the radiu

Romashka [77]

Answer:

There was 62.23% change in radius as the ion formed.

Step-by-step explanation: