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Schach [20]
3 years ago
9

Can someone solve this?

Mathematics
2 answers:
Gnom [1K]3 years ago
8 0

Answer:

130z-3

Step-by-step explanation:

Break down the equation:

(9z^{2}-4)=

9z * 9z= 81z

You can't subtract 4, so I left it at (81z- 4)

(7z^{2}+ 1)=

7z * 7z= 49z

You can't add 1, so I left it at (49z+ 1)

Then Solve:

You can add 81z and 49z.

81z+49z= 130z

-4+1= -3

Hope this helps!

bija089 [108]3 years ago
3 0

47z²−25

Step-by-step explanation:

3627272727822881818181

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There are 7 girls and 9 boys on a playground.
Anon25 [30]

The ratio of the number of girls to the total number of children is 7 : 16.

<h3>Ratio is defined as follows:</h3>
  • It is a comparison between two or more numbers that measures sizes in relation to each other
  • It describe how much of a thing is compared to another.

The number of girls in the playground = 7

The number of boys in the playground = 9

The total number in the playground is the sum of the number of girls and the number of boys.

Therefore,

total children in the playground = 7 + 9 = 16

The ratio of the number of girls to the total number of children can be express as follows:

  • Ratio  = 7 : 16

learn more on ratio here: brainly.com/question/26169121?referrer=searchResults

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An electronics store reduced the price of a TV from $1200 to $1068. What was the percent of decrease? (please explain the formul
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The angle of elevation of a tower, 45 m high from a ball on the ground 52 degree (a) how far is the ball from the foot of the to
blsea [12.9K]

The distance of the ball from the foot of the tower is : 35.18m

The ball would be moved 57.2m away from the foot of the tower for the Angle of elevation to be halved.

<h3>What is angle of elevation?</h3>

Angle of elevation is the angle formed between the horizontal and the  line of view from the vertical.

Analysis:

The height of the tower and the distance of the ball from the foot of the tower form a right angle triangle.

so we use trigonometry.

a) let distance of the ball from foot of tower be x.

  so that, tan 52 = 45/x

  x = 45/tan52

  x = 45/1.279 = 35.18m

b) let the distance of the ball in the new position from the foot of the tower be y.

if the angle of elevation is halved, then new angle is 52/2 = 26°

 tan 26 = 45/y

y = 45/tan26 = 45/0.487 = 92.4m

distance moved from old position to new position = 92.4 - 35.18 = 57.2m

In conclusion, the distance of the ball from the foot of the tower and the distance the ball should move to make its elevation 26° are 35.18m and 57.2m respectively.

Learn more about angle of elevation: brainly.com/question/88158

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