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
alexira [117]
3 years ago
11

A bag contains blue marbles and red marbles, 31 in total. The number of blue marbles is 9 less than 3 times the number of red ma

rbles. How many blue marbles are there?
Mathematics
1 answer:
max2010maxim [7]3 years ago
6 0

Answer:21 blue marbles

Step-by-step explanation:

(3r-9)+r=31

4r-9=31

4r=40

r=10 Red marbles

B+

b+(10)=31

b=21 blue marbles

You might be interested in
How do you solve 12+5x = 18+3x
guajiro [1.7K]

Answer: x = 3


Step-by-step explanation:Simplifying

12 + 5x = 18 + 3x

Solving

12 + 5x = 18 + 3x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3x' to each side of the equation.

12 + 5x + -3x = 18 + 3x + -3x

Combine like terms: 5x + -3x = 2x

12 + 2x = 18 + 3x + -3x

Combine like terms: 3x + -3x = 0

12 + 2x = 18 + 0

12 + 2x = 18

Add '-12' to each side of the equation.

12 + -12 + 2x = 18 + -12

Combine like terms: 12 + -12 = 0

0 + 2x = 18 + -12

2x = 18 + -12

Combine like terms: 18 + -12 = 6

2x = 6

Divide each side by '2'.

x = 3

Simplifying

x = 3




6 0
3 years ago
Read 2 more answers
What is an equation of the line that passes through the point (8,-2) and is perpendicular to the line 4x+3y=3
Zepler [3.9K]

Answer:

y = 3/4x - 8

Step-by-step explanation:

7 0
1 year ago
Lavania is studying the growth of a population of fruit flies in her laboratory. After 6 days she had nine more than five times
MatroZZZ [7]

Answer:

Lavania observed 39 fruit flies after 6 days of observation

Step-by-step explanation:

Let x be the number of fruit flies on the first day of Lavania's study.

After 6 days she had nine more than five times as many fruit flies as when she began the study.

Five times as many fruit flies as when she began the study = 5x

Nine more than five times as many fruit flies as when she began the study=5x+9

The expression to find the population of fruit flies Lavania observed after 6 days is 5x+9

If she observes 20 fruit flies on the first day of the study, then x=6, then

5x+9=5\cdot 6+9=30+9=39

5 0
3 years ago
Question 1
viktelen [127]

Given:

The demand function is,

Q=-3p^2+2p+1970

The total revenue function is,

\begin{gathered} TR=p\times Q \\ TR=p\times(-3p^2+2p+1970) \\ TR=-3p^3+2p^2+1970p \end{gathered}

Answer:

TR=-3p^3+2p^2+1970p

3 0
1 year ago
Find the center and radius for the circle, given the equation: x^2-14x+y^2+8=16
Strike441 [17]
You can do this by completing the square

x^2 - 14x + y^2 + 8  = 16

(x - 7)^2 - 49 + (y + 4)^2 - 16  = 16

(x - 7)^2 + (y + 4)^2 =   16 + 16 + 49  =  81


so the center is at (7 , -4) and radius = sqrt81 = 9
5 0
3 years ago
Other questions:
  • The germination rate is the rate at which plants begin to grow after the seed is planted.
    6·1 answer
  • What is the value of the expression? ​−2.1(4.7+(−7.4))​ HELPPP
    15·2 answers
  • 4n+22=70, find the value for 3n
    12·1 answer
  • Which equation represents a nonlinear function?
    15·1 answer
  • How many ounces of nuts are there in a box that holds 3.2 pounds
    5·1 answer
  • Can someone help me!!!
    15·1 answer
  • A jewelry store has 9/10 of an ounce of gold. They need to split it into 1/6 ounce groups. How many groups can they make?
    12·2 answers
  • If you flip a coin and roll a 6-sided die, what is the probability that you will flip a heads and roll a 5?
    6·2 answers
  • A Ferris wheel completes 7 revolutions in 14 minutes. The radius of the Ferris wheel is 30 feet.
    5·1 answer
  • If the circumference of a circle is 12.56 ft what is the diameter?​
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!