1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vlad1618 [11]
3 years ago
14

What is 8a = 5a + 21 please and thank you

Mathematics
2 answers:
Sergeeva-Olga [200]3 years ago
3 0
8a-5a=21
3a=21
a=21/3
a=7
djyliett [7]3 years ago
3 0
Here's the answer to your question

You might be interested in
One of the tallest buildings in a country is topped by a high antenna. The angle of elevation from the position of a surveyor on
irina1246 [14]

Answer:

a. distance of the surveyor to the base of the building = 2051.90 ft

b. height of the building = 1384 ft

c. Angle of elevation from the surveyor to the top of the antenna = 38.31°

d. Height of antenna  =  237.08 ft

Step-by-step explanation:

​The picture above is a illustration of the described event.

a = the height of the flag

b = the height of the building

c = distance of the surveyor from the base of the building

the angle of elevation from the position of the surveyor on the ground to the top of the building = 34°  

distance from her position to the top of the building  = 2475 ft

distance from her position to the top of the flag  = 2615 ft

​(a) How far away from the base of the building is the surveyor​ located?​

using the SOHCAHTOA principle

cos 34° = c/2475

c =  0.8290375726  × 2475

c = 2051.8679921

c = 2051.90 ft

(b) How tall is the​ building

The height of the building = b

sin 34° = opposite /hypotenuse

0.5591929035 = b/2475

b =  0.5591929035  × 2475

b =  1384.0024361

b =  1384.00 ft

​(c) What is the angle of elevation from the surveyor to the top of the​ antenna?

let the angle = ∅

cos ∅ = adjacent/hypotenuse

cos ∅ = 2051.90/2615

cos ∅ =  0.784665392

∅ = cos-1  0.784665392

∅ =   38.310258303

∅ =  38.31°

​(d) How tall is the​ antenna?

height of the antenna = a

sin 38.31° = opposite/hypotenuse

sin 38.31° = (a + b)/2615

sin 38.31° × 2615 = (a + b)

(a + b) =  0.6199159917  × 2615

(a + b) =  1621.0803182

(a + b) = 1621. 08 ft

Height of antenna = 1621. 08 - 1384.00  =  237.08031822 ft

Height of antenna  =  237.08 ft

8 0
3 years ago
Which of the following is true?
Ratling [72]

In this question, we're trying to find the inequality that is true.

To find your answer, we can convert the numbers in the absolute value:

|−5| < 4:

5 < 4 <em>false</em>

|−4| < |−5|:

4 < 5 <em>true </em>

|−5| < |4|

5 < 4 <em>false</em>

|−4| < −5

4 < -5 <em>false</em>

The only true inequality here would be |−4| < |−5|, since it works with the inequality sign.

Answer:

|−4| < |−5|

4 0
3 years ago
Express 0.77230.77230, point, 7723 as a fraction
cricket20 [7]

Answer:

7723/10000

Step-by-step explanation:

8 0
3 years ago
Find the square root. <br> -√1/9
harina [27]

Answer:

-1/9

that's the answer.

BRAINLIEST PLEASE

4 0
3 years ago
What is the correct answer? Please provide an explanation.
ryzh [129]

Answer:

A 270° rotation about point B'

Step-by-step explanation:

Rotation is clockwise so you can see that the final transformation is a rotation 270° clockwise

4 0
3 years ago
Read 2 more answers
Other questions:
  • The heights of three flower pots are 45cm 30cm and 10cm.
    5·1 answer
  • Solve.<br> 2x + 6 ≥ -8<br><br> A.) x ≥ -8<br><br> B.) x ≤ -8<br><br> C.) x ≥ -5<br><br> D.) x ≤ -5
    7·1 answer
  • Sara and Jon each ordered a medium pizza. Sara ate 3/8 of her pizza for lunch and 1/4 for a snack. Jon ate 1/2 of his pizza for
    8·1 answer
  • How many unique triangles can be made where one angle measures 98° and another angle is an obtuse angle?
    11·2 answers
  • Pls Hurry! I Will Give Brainliest!
    9·2 answers
  • If that is = a, find the value of a + 1 over a<br><img src="https://tex.z-dn.net/?f=3%20-%20%20%5Csqrt%7B5%7D%20" id="TexFormula
    13·1 answer
  • Q6) You have a credit card that awards you a "cash back bonus." This means that every time you use your credit card to make a pu
    9·1 answer
  • An employee works 22 days
    10·1 answer
  • if we have 10 slices of sandwiches and each 2 person take one how many slices do we still have..its easy​
    7·1 answer
  • Solve by the elimination method. Check your work.
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!