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
densk [106]
3 years ago
11

Solve.

Mathematics
2 answers:
lions [1.4K]3 years ago
6 0

Answer:

b=9,a=12

Step-by-step explanation:

I solved by substitution:

b = 3/4a  ---> plug this into the other equation

a + b = 21   is now    a + 3/4a = 21

Reduce: 7/4a = 21

a = 12

Now solve for b:

b=3/4a is now b=3/4(12)

b=9

Setler [38]3 years ago
6 0

Answer:

a=12 b= 9

Step-by-step explanation:

did the quiz

You might be interested in
Mr.jeff divided his money in the ratio 4:2 between Jon and jack Jon got the smaller amount of $1,256 how much did jack get?
nadezda [96]
Ratio in which Mr.Jeff divided his money between Jack and Jon = 4:2
Let us assume the common ration to be = x
The amount of money that Jon got = $1256
Then
2x = 1256
x = 1256/2
   = 628
Then
The amount of money that Jon got = 4 * 628 dollars
                                                         = 2512 dollars
So the amount that Jack got is $2512. As Jack got the major or the bigger share of the money, so the answer is correct. I hope the procedure for solving the question is also easy for you to understand.
6 0
3 years ago
John buys 100 shares of stock at $100 per share. The price goes up by 10% and he sells 50 shares. Then, prices drop by 10% and h
Juliette [100K]
The profit that John got from the last 50 was $5000.
5 0
3 years ago
Solve for x.<br><br> 8x^2-3=2
Mazyrski [523]
(2^3x^2 -  3) -  2  = 0 \\ \\  Factoring:  \ 8x^2-5 \\ \\   8x^2 - 5  = 0 \\ \\  Add \ 5  \ to \ both \ sides \ of \ the \ equation : \\ \\ &#10;                      8x^2 = 5 \\ \\ Divide \ both \ sides \ of \ the \ equation \ by \ 8: \\ \\ &#10;                     x^2 =  \frac{5}{8}  = 0.625 \\ \\ \boxed{ x  =\pm  \sqrt 5/8}

Your answer: Option A
7 0
3 years ago
At the beginning of this month, the balance of Agatha's checking account was $782.39. So far this month, she has received a payc
Arturiano [62]
B. 1582.15
I hope this helps
3 0
2 years ago
A carpet square is 9inches what’s the area of the carpet square?
AleksAgata [21]

Answer:

The area of the carpet which is square in shape is  81 inches^2

Step-by-step explanation:

Given:

side of the carpet square  = 9 inches

To Find:

area of the carpet square = ?

Solution:

The area of the carpet =  area of the square

we know that the area of the square  is

=> side X side

Substituting the side of the square, we get

=> 9 X 9

=> 81 inches^2

6 0
3 years ago
Other questions:
  • What is the GCF of 28 and 40
    5·1 answer
  • 2/11 , 8/15, 7/13, 5/12<br> Which fraction does not belong with the other three?
    7·1 answer
  • The total bill is $61.35. How much should each of the 5 people pay if the bill is evenly split?
    11·2 answers
  • Sienna has 534 pounds of grapes. She eats 18 pound and gives 212 pounds to her brother.
    12·2 answers
  • Is -1/3 greater than -1/2?
    13·2 answers
  • Solve. -5/6m = -60. <br>​
    14·1 answer
  • The number 30 is divisible by... select all that apply.
    7·1 answer
  • Please help me with the question below.
    6·2 answers
  • Find the exact value of each expression.<br> sin75°<br> cos(-75°)
    8·2 answers
  • List all of the prime numbers<br> between 10-20.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!