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almond37 [142]
3 years ago
6

There are 12 yellow marbles in a bag of 18 marbles. How many more yellow marbles would need to be added to change the ratio of y

ellow marbles to total marbles to 3:4?
Mathematics
1 answer:
Archy [21]3 years ago
3 0

Answer:

add 6 yellow marbles

Step-by-step explanation:

12 yellow marbles in a bag of 18 marbles....if ur adding 1 yellow marble, u are also adding 1 marble to the total of marbles...

so adding 1 makes u have 13 yellow to 19 marbles..13/19 does not equal 3/4

add 2....making it 14 yellow to 20 marbles.....14/20 does not equal 3/4

add 3.....15 yellow to 21 marbles....doe not equal 3/4

add 4....16 yellow to 22...nope

add 5....17 yellow to 23...nope

add 6....18 yellow to 24.....18/24 = 3/4 or 3:4 ratio

I know there has to be an easier way to find this...I just dont know it.

But if u add 6 yellow marbles.....which adds 6 marbles to the total marbles....means u have 18 yellow marbles in a bag of 24 marbles...

18/24 = 3/4......it is now a ratio of yellow to total marbles = 3:4

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2b^2x^2+3a^2y^2=a^2b^2 for b^2
Artemon [7]

Answer:

{b}^{2}  =  \frac{3 {a}^{2}  {y}^{2} }{ {a}^{2}  - 2 {x}^{2} }

Step-by-step explanation:

We want to solve for b² in

2 {b}^{2}  {x}^{2}  + 3 {a}^{2}  {y}^{2}  =  {a}^{2}  {b}^{2}

Combine terms containing b²

3 {a}^{2}  {y}^{2}  =  {a}^{2}  {b}^{2}  - 2 {b}^{2}  {x}^{2}

Factor b² to get:

3 {a}^{2}  {y}^{2}  =  ({a}^{2} - 2 {x}^{2}) {b}^{2}

Divide by a² -2b²

{b}^{2}  =  \frac{3 {a}^{2}  {y}^{2} }{ {a}^{2}  - 2 {x}^{2} }

4 0
3 years ago
A college has a student to teacher ratio of 25 to 2. If there are 190 teachers at the college, how many students attend the coll
lara [203]

25 to 2 means for every 25 students there are 2 teachers.


Divide the total number of teachers by their ratio:

190 / 2 = 95


Now multiply that by the student ratio:

95 * 25 = 2,375 total students.



4 0
3 years ago
Ms. Anderson deposits $7,000 into a savings account that pays a simple interest of 2% per year. What is the total amount of mone
Reika [66]

Answer:

$7420

Step-by-step explanation:

First, converting R percent to r a decimal

r = R/100 = 2%/100 = 0.02 per year,

then, solving our equation

I = 7000 × 0.02 × 3 = 420

I = $ 420.00

The simple interest accumulated

on a principal of $ 7,000.00

at a rate of 2% per year

for 3 years is $ 420.00.

5 0
3 years ago
Write the equation of the line in fully simplified slope intercept form
Lisa [10]

Answer:

y = 6x - 5

Step-by-step explanation:

In order to determine the slope-intercept form, y = mx + b, of the given line:

You need to find the slope (m) and determine the y-intercept (b).  

Given the points (1, 1) and (0, -5):

Let (x1, y1) = (1, 1)

(x2, y2) = (0, -5)

Use the following formula for slope:

m = (y2 - y1)/(x2 - x1)

m = (-5 - 1)/(0 - 1)

m = -6/-1

m = 6

The slope of the line is 6.

Next, the y-coordinate (b) of the point, (0, <em>b</em> ) is the y-intercept of the line where the graph of the linear equation crosses the y-axis. The y-intercept is also the value of y when x = 0.

Looking at the graph, you'll see that the line crosses at point (0, -5). We used this point earlier to solve for the slope. Hence, the y-coordinate, b =  -5, is the y-intercept.

Given the slope, m = 6, and the y-intercept, b = -5:

The linear equation in slope-intercept form is: y = 6x - 5.

Please mark my answers as the Brainliest if you find this helpful :)

3 0
3 years ago
The ages of employees at a certain company are normally distributed and the mean age is 36 with a standard deviation of 3 years.
Mars2501 [29]
The empirical rule for a normal distribution states that 95% of the data points lie within plus and minus two standard deviations from the mean. 30 is two standard deviations below the mean and 42 is two standard deviations above the mean.
Therefore, 95% if the employees are between 30 and 42 years old.
8 0
3 years ago
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