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Digiron [165]
3 years ago
8

A bag is filled with marbles. You take out and mark 80 marbles. Then you put the marbles back in the bag and mix the marbles. In

a sample of 20 marbles, 4 of the marbles are marked. About how many marbles are in the bag?

Mathematics
2 answers:
evablogger [386]3 years ago
7 0
There are about 400 marbles
noname [10]3 years ago
3 0
About 400 marbles. You simply set up a proportion and solve it as I did in the photo attached.

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Pls help!! will give all my points
sergejj [24]

when x=-2

-10(-2)+y=4

y=4-20

y=-16

when x=-1

-10(-1)+y=4

y=-6

when x=0

-10(0)+y=4

y=4

when x=1

-10(1)+y=4

y=14

when x=2

-10(2)+y=4

y=24

8 0
3 years ago
Read 2 more answers
Someone help me please!
andriy [413]

Answer:

To solve the first inequality, you need to subtract 6 from both sides of the inequality, to obtain 4n≤12. This can then be cancelled down to n≤3 by dividing both sides by 4. To solve the second inequality, we first need to eliminate the fraction by multiplying both sides of the inequality by the denominator, obtaining 5n>n^2+4. Since this inequality involves a quadratic expression, we need to convert it into the form of an^2+bn+c<0 before attempting to solve it. In this case, we subtract 5n from both sides of the inequality to obtain n^2-5n+4<0. The next step is to factorise this inequality. To factorise we must find two numbers that can be added to obtain -5 and that can be multiplied to obtain 4. Quick mental mathematics will tell you that these two numbers are -4 and -1 (for inequalities that are more difficult to factorise mentally, you can just use the quadratic equation that can be found in your data booklet) so we can write the inequality as (n-4)(n-1)<0. For inequalities where the co-efficient of n^2 is positive and the the inequality is <0, the range of n must be between the two values of n whereby the factorised expresion equals zero, which are n=1 and n=4. Therefore, the solution is 1<n<4 and we can check this by substituting in n=3, which satisfies the inequality since (3-4)(3-1)=-2<0. Since n is an integer, the expressions n≤3 and n<4 are the same. Therefore, we can write the final answer as either 1<n<4, or n>1 and n≤3.

5 0
3 years ago
Please need help for question number 26
kherson [118]

(8,12)(14,3)


Use midpoint formula


(X1+x2/2, y1+y2/2)


Substitute with your points


(8+14/2, 12+3/2)


Solve each


(22/2,15/2)


Cancel common factor 2


(2×(4+7)/2(1),15/2)


Simplify

(4+7/1,15/2)


This is your midpoint

(11, 15/2)




3 0
3 years ago
192 oz = _____lb what is it help meh ^•_•^
Tems11 [23]

Answer:

12 pounds

Step-by-step explanation:

there are 16 ounces in a pound

192/16= 12

4 0
3 years ago
Read 2 more answers
What is the significance of the value 0.31 in the context of the data? A It represents the probability that a student in Mr. Lop
Dvinal [7]

Step-by-step explanation:

The significance level, also denoted as alpha or α, is the probability of rejecting the null hypothesis when it is true. For example, a significance level of 0.05 indicates a 5% risk of concluding that a difference exists when there is no actual difference

6 0
2 years ago
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