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Nutka1998 [239]
3 years ago
14

—2+7+(-4). Evaluate

Mathematics
2 answers:
MakcuM [25]3 years ago
5 0

Answer:

1

Step-by-step explanation:

-2 + (-4) = -6 + 7 = 1

evaluate = solve

ruslelena [56]3 years ago
4 0

Answer:

The answer is 1

Step-by-step explanation:

-2+7=5

5+(-4)= 1

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PlEASE please i need to finish this hw
Rus_ich [418]

Answer:

24

Step-by-step explanation:

angle = 38

opposite of angle = 15

hypotenuse = c

sohcahtoa

sin utilizes both opposite and hypotenuse

thus,

sin(38) = 15/c

multiply both sides by c to make it a numerator

csin(38) = 15

divide both sides by sin(38) to get c

c = 15/sin(38) ≈ 24

4 0
2 years ago
What is the length of AB
Anettt [7]

Answer:

\boxed{\boxed{\overline{AB}=16}}

Step-by-step explanation:

In the triangle ABC, m∠ABC=90°. Hence, it is right angle triangle.

\tan \theta=\dfrac{p}{b}=\dfrac{AB}{64}  --------1

In the triangle ABD, m∠ABD=90°. Hence, it is right angle triangle.

\cot (90-\theta)=\dfrac{b}{p}=\dfrac{4}{AB}

As \cot (90-\theta)=\tan \theta, so

\tan \theta=\dfrac{b}{p}=\dfrac{4}{AB}  ---------2

From equation 1 and 2,

\Rightarrow \dfrac{AB}{64}=\dfrac{4}{AB}

\Rightarrow AB^2=64\times 4

\Rightarrow AB^2=256

\Rightarrow AB=\sqrt{256}

\Rightarrow AB=16


5 0
3 years ago
Consider a civilization broadcasting a signal with a power of 2.0×104 watts. The Arecibo radio telescope, which is about 300 met
Vitek1552 [10]

For light: Inverse Square Law 

<span>
The signal is weaken by the inverse square of the difference of distances this means that one over the square of the difference. </span>

<span>
</span>

Therefore, 70000LY / 141 LY =496.45 and that squared =246462.602 times less signal, or 1/246462.602.


 2 For a circular telescope like the Arecibo radio telescope that equals Pi times the radius squared. Sensitivity of the telescope depends on its area.<span>
The new telescope needs 246462.60 times that area to have enough sensitivity </span>

<span>
<span>(150 x 150 x Pi) = 70 685 sq m area for the Arecibo telescope and that times 246462.60
= 1.74212 x 10^10</span></span>

<span><span>
</span></span>

What is the diameter of a circle with that area?

 <span>
<span>1. Divide the area by Pi = 5.548156 x 10^9
2. Take the square root of the result to find the radius = 74485.94293</span></span>

3. Multiply by 2 to find the diameter = <span>148971.886</span>

7 0
3 years ago
5. Find the equation of the line that goes through the points (4,7) and (-2,-5)
Lelechka [254]

Answer:

equation= y-y¹=m(x-x¹)

where m= gradient or slope

slope = <u>y²-y¹</u>

x²-x¹

= -<u>5-7</u>

-2-4

<u>-</u><u>1</u><u>2</u>

-6

= 2

equation= y-7=2(x-4)

y-7=2x-8

y= 2x-8+7

y=2x-1

8 0
2 years ago
Plzzzzzz help plzzzzzzz
Alenkinab [10]
I think it’s x= 115 degrees hope this helps :)
7 0
3 years ago
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