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beks73 [17]
3 years ago
7

If a tree 28 meters tall casts a shadow 32 meters long, what is the angle of elevation of the sun to the nearest degree?

Mathematics
2 answers:
blagie [28]3 years ago
7 0
We need an angle measure we have to use an inverse trig ratio, sin^-1, cos^-1, or tan^-1.
Setting up the right triangle we have the opposite and adjacent so we use tan.
tan angle = 28/32
tan^-1 (28/32) = 41 degrees
zysi [14]3 years ago
4 0
Height = 28m
shadow = 32

Angle = tan^-1 (28/32) = 41.18 degree

Hope it helps!
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Which equation is true?
ch4aika [34]

Answer : 9x^2 - 25 = (3x - 5)(3x + 5)

(1) 9x^2 - 25 = (3x - 5)(3x - 5)

Use FOIL method to mulitply (3x – 5)(3x – 5)

(3x - 5)(3x - 5)  = 9x^2 - 30x + 25

(2) 9x^2 - 25 = (3x - 5)(3x + 5)

Use FOIL method to mulitply (3x - 5)(3x + 5)

(3x - 5)(3x - 5)  = 9x^2 - 15x + 15x - 25 = 9x^2 - 25

(3) 9x^2 - 25 = -(3x + 5)(3x + 5)

Use FOIL method to mulitply -(3x + 5)(3x + 5)

-(3x + 5)(3x + 5)  = -(9x^2 + 30x + 25) = -9x^2 -30x -25

(4) 9x^2 - 25 = -(3x + 5)(3x - 5)

Use FOIL method to mulitply -(3x + 5)(3x - 5)

-(3x + 5)(3x - 5)  = -(9x^2 - 25) = -9x^2 + 25

So equation 2 is true

6 0
3 years ago
Read 2 more answers
Simplify x^2-9x-22/x-11
OleMash [197]

Answer:

x^2-11/-8x

Step-by-step explanation:

We can solve this equation easily by using PEMDAS, or order of operations.

<u>Parenthesis</u>

<u>Exponents</u>

<u>Multiplication>Division (Depends on which comes first left to right)</u>

<u>Addition>Subtraction (See multiplication>division)</u>

Now that we know the order of the operations, we can solve.

First, we cant solve for x^2 because we dont know the value of x, so well leave that alone. Same with 22/x. All we can do is use the commutative property.

So our equation is now x^2-11/-8x

Hope this helps!

6 0
3 years ago
1. 7(6-(-4))<br> What is this I don’t know
Marina CMI [18]
So you would start with removing the parentheses so 6- - 4 would be 6+4 because the double negative and then that would be 10 so 7 times 10 so your answer is 70
5 0
3 years ago
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E graph shows the altitude of a helicopter over time.
DaniilM [7]

Let

x-------> the time

y-------> the altitude of a helicopter

Step 1

<u>Find the slope of the line</u>

we know that

the slope m of the line between two points is equal to

m=\frac{(y2-y1)}{(x2-x1)}

we have

(x1,y1)=(0,10,000)\\(x2,y2)=(15,4,000)

substitute in the formula

m=\frac{(4,000-10,000)}{(15-0)}

m=\frac{(-6,000)}{(15)}

m=-400\frac{feet}{minute}

therefore

<u>the answer is the option </u>

The slope is -400 . This means that the helicopter descends 400 ft each minute.


4 0
3 years ago
Y=-5x-20x-26<br>what is the axis of symmetry, the vertex, and sketch
amm1812
Vertex: (1,-6)
Axis of symmetry: x=1
Hope this helped!
7 0
3 years ago
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