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
a 28 inch piece of steel is cut into three pieces so that the second piece is twice as long as the first piece, and the third pi
klasskru [66]
Where x is the length of the first piece
x + 2x + 6x + 1 = 28 \\  \\ 9x = 27 \\  \\ x = 3
so the first piece is 3 inches, the second is 6 inches and the third is 19 inches
3 0
3 years ago
PLEASE HELP Due today!
AlexFokin [52]

Answer:

it looks like it is Addition Property Of Equality

Step-by-step explanation:

7 0
3 years ago
How many inches are in 6 & a half yards
Fittoniya [83]
The anwser is 234 inches
6 0
3 years ago
Read 2 more answers
Write the expression as a square of a monomial. <br><br><br><br><br><br><br><br><br><br> a 81x^4
poizon [28]

Answer:

(9x²)²

Step-by-step explanation:

Given the expression 81x⁴, to write the expression as a square of a monomial, first we will assign a variable to the expression.

y = 81x⁴

Then we take the square root of both sides of the expression

√y = √81x⁴

y^½ = √81 × √x⁴

y^½ = 9x²

Squaring both sides of the resulting equation to get y back

(y^½)² = (9x²)²

y = (9x²)²

The expression as a square of a monomial is (9x²)²

7 0
3 years ago
Read 2 more answers
Quadratics need help making parabola
timama [110]

Answer:

The equation of the parabola is y = \frac{1}{3}\cdot x^{2}-\frac{4}{3}\cdot x -4, whose real vertex is (x,y) = (2, -5.333), not (x,y) = (2, -5).

Step-by-step explanation:

A parabola is a second order polynomial. By Fundamental Theorem of Algebra we know that a second order polynomial can be formed when three distinct points are known. From statement we have the following information:

(x_{1}, y_{1}) = (-2, 0), (x_{2}, y_{2}) = (6, 0), (x_{3}, y_{3}) = (0, -4)

From definition of second order polynomial and the three points described above, we have the following system of linear equations:

4\cdot a -2\cdot b + c = 0 (1)

36\cdot a + 6\cdot b + c = 0 (2)

c = -4 (3)

The solution of this system is: a = \frac{1}{3}, b = - \frac{4}{3}, c = -4. Hence, the equation of the parabola is y = \frac{1}{3}\cdot x^{2}-\frac{4}{3}\cdot x -4. Lastly, we must check if (x,y) = (2, -5) belongs to the function. If we know that x = 2, then the value of y is:

y = \frac{1}{3}\cdot (2)^{2}-\frac{4}{3}\cdot (2) - 4

y = -5.333

(x,y) = (2, -5) does not belong to the function, the real point is (x,y) = (2, -5.333).

5 0
3 years ago
Other questions:
  • Using the completing-the-square method, find the vertex of the function f(x) = 5x2 + 10x + 8 and indicate whether it is a minimu
    11·1 answer
  • What is the square root of 64?
    8·2 answers
  • Use rounding to estimate 2.57 +0.14
    9·2 answers
  • Rita and Tina each make $11 an hour working as cashiers at a supermarket. Last week, Rita worked r hours while Tina worked t hou
    15·1 answer
  • 2 1/2 ÷ 4=?????<br> please help me
    8·2 answers
  • What will be the new position of the given point (9,-4) after reflection across the y axis
    13·2 answers
  • Help ‍♂️‍♂️‍♂️‍♂️‍♂️‍♂️‍♀️‍♀️‍♀️‍♀️‍♀️‍♀️‍♀️‍♀️‍♀️‍♀️‍♀️‍♂️‍♂️‍♀️‍♀️‍♀️‍♂️‍♂️‍♂️‍♂️‍♂️
    5·2 answers
  • What is 3/4 divided by 3/5?
    5·2 answers
  • Calculate the mean of 7, 3, 5, 6 , 0. Single choice.
    8·1 answer
  • How do i find the volume in 3d shapes, please help i need to get better grades
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!