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
Sladkaya [172]
2 years ago
8

А + B = 8, A*C = 21, B-D=5С*D= 9findА,В,С,D​

Mathematics
1 answer:
Tanya [424]2 years ago
5 0

Answer:

<em><u>A = 2.1</u></em>

<em><u>B = 5.9</u></em>

<em><u>C = 10</u></em>

<em><u>D = 0.9</u></em>

Step-by-step explanation:

This is a long one

A + B = 8

my plan is to substitute B

B - D = 5

B = 5 + D

Now substitute D

C*D=9

D = 9/C

Now substitute C

A*C = 21

C = 21/A

Back to the D equation

D = 9/C

D = 9/(21/A) = 9A/21 = 3A/7

Back to B equation

B = 5 + D

B = 5 + 3A/7

Back to A equation

A + B = 8

A + (5 + 3A/7) = 8

7/7A + 3/7A + 5 = 10A/7 + 5 = 8

10A/7 = 3

10A = 21

<u><em>A = 21/10 = 2.1</em></u>

The rest <em>should</em> be simple

B = 5 + 3A/7

<u><em>B = 5 + 3(2.1)/7 = 5.9</em></u>

C = 21/A

<em><u>C = 21/2.1 = 10</u></em>

D = 9/C

<em><u>D = 9/10 = 0.9</u></em>

You might be interested in
Please answer the questions below.
hoa [83]

Answer:

if give brainliest i will answer

Step-by-step explanation:

7 0
2 years ago
Order 3, -4,7,-1 and -6 from least to greatest
katrin [286]
-6, -4, -1, 3, 7

Hope this helps!
5 0
3 years ago
Read 2 more answers
The side length of a square is x+1. write an expression that is equivalent to the perimeter of the square.
Amiraneli [1.4K]
4x + 4

This is because there are four sides of a square, and each side is x + 1.

x + 1 + x + 1 + x +1 + x + 1 = 4x + 4
4 0
3 years ago
hat is the approximate distance between Portland, Oregon (45° north, 122° west), and San Francisco, California (37° north, 122°
juin [17]
<span>Since both places are on the same longitude (122° west) and different lattitudes 45° north and 37° north, the distance between the two place lies on a great circle (along a line of longitude). Difference in latitudes = 45 - 37 = 8° (subtract the lattitudes because both sides are on the same side in the latitude i.e. both are north) The distance between two points along the line of longitude is given by theta / 360 x 2 x pi x R: where theta = 8° and R is the radius of the earth = 3,960 miles. d = 8 / 360 x 2 x pi x 3960 = 552.9 miles</span>
8 0
3 years ago
What+is+the+slope+of.the+liine+of+the+passng+through+point+(0,-5)and+(4,2)
Jlenok [28]
7/4 is the slope for this question
7 0
3 years ago
Other questions:
  • If the radius of circle A is 6 units, calculate the area of the shaded region...
    12·1 answer
  • The sector of a circle with a 12 inches radius has a central angle measure of 60°.
    5·1 answer
  • 1/5x - 2/3y = 30 , when y = 15
    13·1 answer
  • How do you do perimeters
    15·1 answer
  • Multiply.<br><br><br><br> –58.7 • 13<br><br><br> Divide.<br><br> -6 ÷ 1/4
    10·1 answer
  • PLEASE SOMEONE HELP EASY Y6 QUESTION
    6·2 answers
  • A(1) = 20<br> (a(n) = a(n − 1) – 17<br> Find the 3rd term in the sequence.
    7·1 answer
  • Which represents the solution set to the inequality
    5·1 answer
  • The deli gets 12 -pound blocks of cheese. They slice the cheese into 1/4 - pound and 1/2 ​ - pound packages to sell to customers
    11·2 answers
  • Remind anyone? or no?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!