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lorasvet [3.4K]
3 years ago
12

1:x=x:64 what one number can replace x

Mathematics
2 answers:
zubka84 [21]3 years ago
8 0
I think 1 can replace x i hope i helped u. good luck brainly user :)

aleksandr82 [10.1K]3 years ago
7 0

Answer:

x can be replaced by 8 and -8

Step-by-step explanation:

Given : 1: x = x:64

We have to find the value of x,

Consider 1: x = x:64

This is same as writing,

\frac{1}{x}=\frac{x}{64}

\mathrm{Apply\:fraction\:cross\:multiply:\:if\:}\frac{a}{b}=\frac{c}{d}\mathrm{\:then\:}a\cdot \:d=b\cdot \:c

64=x^2

Taking square root both sides, we have,

x=\sqrt{64}

We know \sqrt{64}=\pm 8

x=\pm 8

Thus, x has two values x = 8 and x = -8

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Susan and Mark are standing at different places on a beach and watching a bird. The angles of elevation they make are 20º and 50
Mandarinka [93]

Answer:

The bird is 2.44km high

Step-by-step explanation:

Hello,

To solve this question, we need to understand how they are and we can only get this with a correct pictorial diagram.

See attached document for better understanding.

From the first diagram, we understand that the bird is between them and also on top of them.

Assuming Susan, Mark and the bird all form a triangle at each other and the bird at the top, we can divide the the triangle into two equal parts.

But before then, we should know that sum of angles in a triangle is equal to 180°

Therefore,

20° + 50° + b° = 180

70° + b = 180

b = 180° - 70°

b = 110°

Dividing angle b into two equal parts = 55° on each side.

See the last attached document for better illustration.

Using SOHCAHTOA, we can find the adjacent of the triangle which corresponds to the height of the bird.

We have opposite = 3.4km and we're looking for adjacent. We can use tangent of the angle to find the adjacent.

Tanθ = opposite / adjacent

Tan 55° = 3.5 / adj

Adjacent = 3.5 / tan55

Adjacent = 3.5 / 1.43

Adjacent = 2.44km

The height of the bird is 2.44km

7 0
4 years ago
El área de un rectángulo es 675cm2, si el largo es 3 veces. ¿Cuáles son las dimensiones del rectángulo?
Gala2k [10]
The answer is 15 cm. Hope I could be of help! ; )
7 0
3 years ago
Uhm I have no idea how to answer this I’ve been trying for the past like 3 days
ycow [4]
................................
5 0
4 years ago
Read 2 more answers
28 percent of 63 is what
baherus [9]
The answer is 17.64    

4 0
3 years ago
Read 2 more answers
Make x the subject of the formula<br>y = mx + b​
zubka84 [21]

Step-by-step explanation:

y=mx+c

Take c from both sides:

y-c = mx

Divide both sides by m:

(y-c) / m =x

Now swap sides to make it prettier:

x = (y-c) / m

6 0
3 years ago
Read 2 more answers
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