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mr_godi [17]
3 years ago
9

Which expression represents 81 decreased by an unknown number?

Mathematics
2 answers:
Lyrx [107]3 years ago
6 0

Answer:

Hey, There! my name is Raven and I'm here to help!

<h2>Question</h2>

Which expression represents 81 decreased by an unknown number?

<h2>Answer</h2>

81 − a is the Correct Answer

Step-by-step explanation:

When we Decrease something we take It away or Subtract it from the Amount we had For example If John Had 9 apples  And He gave 2 apples to Jay He would then have 7 apples Because the Amount of apples decreased.

Therefore, I hope this helps!

Take care!

_Raven_

Andrews [41]3 years ago
3 0

Answer:

81 - a

Step-by-step explanation:

<em>Decreased </em>

means to subtract

81 –

<em>by an unknown number</em>

means a variable such as a or x

therefor

81 – a

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The cable railway was driven by a 8 foot diameter drum that turned 13 revolutions per minute. Find the linear velocity of the ca
slava [35]

Answer:

The linear velocity of the cable ≅ 327 feet per minute.

Step-by-step explanation:

Given that the diameter of the drum = 8 feet

Radius of the drum = \frac{diameter}{2}

           = \frac{8}{2}

           = 4 feet

Radius of the drum = 4 feet

1 revolution = circumference of the drum

circumference of the drum = 2\pir

where r is the radius.

So that;

circumference of the drum = 2 x \frac{22}{7} x 4

                                             = \frac{176}{7}

                                            = 25.143

circumference of the drum = 25.143 feet

The linear velocity of the cable = (13 x 25.143) feet per minute

                               = 326.859 feet per minute

The linear velocity of the cable ≅ 327 feet per minute.

8 0
3 years ago
Vic is standing on the ground at a point directly south of the base of the CN Tower and can see the top when looking at an angle
mel-nik [20]

Vic and Dan are 2, 897m apart.

<h3>How to determine the distance</h3>

It is important to note that the distance between Vic and Dan is the base of CN

Let's say the distance to Dan is x

The distance to Vic is y

Using cosine ratio, we have

cos α = opposite / adjacent

α = 72°

opposite = 553. 3cm

Adjacent = x

cos  72° = \frac{553. 3}{x}

Cross multiply

cos 72 × x = 553. 3

0. 3090x= 553. 3

x = \frac{553. 3}{0. 3090}

x = 1, 790. 61 m

The distance to Vic is y

Using the cosine ratio, we have

cos 60 = \frac{553. 3}{y}

Cross multiply

0. 5y = 553. 3

y = \frac{553. 3}{0. 5}

y = 1,106. 6m

To determine how far apart Vic and Dan, we use = x + y

= 1790. 61 + 1106. 6

= 2, 897. 21m

= 2, 897m

Thus, Vic and Dan are 2, 897m apart.

Learn more about bearing and distance here:

https://brainly.in/question/47782732

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7 0
2 years ago
Suppose a sorority is selling 500 raffle tickets to raise money for a local charity. You are going to be the first person to pur
Mrac [35]
251 tickets would give you a 50.2% chance at winning and no one could go higher than you percentage wise. so 251+
6 0
3 years ago
The area of a rectangle is (25x2 − 9y2) square units. Determine the dimensions of the rectangle by factoring the area expression
8_murik_8 [283]

Answer:

(5x+3y) and (5x-3y)

Step-by-step explanation:

From the concept on difference between two squares;

a² - b² = (a+b)(a-b)

Therefore;

25x² - 9y² = (5x+3y) (5x-3y)

Therefore the dimensions of the square are (5x+3y) and (5x-3y)

6 0
4 years ago
Read 2 more answers
Six to the third power times six to the fourth power in exponential form
Marta_Voda [28]

Answer:

6^7

Step-by-step explanation:

<u>Step 1:  Convert</u>

Six to the third power times six to the fourth power.

6^3 * 6^4

6^(^3^+^4^)

6^7

Answer:  6^7

3 0
3 years ago
Read 2 more answers
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