The probability that the first two electric toothbrushes sold are defective is 0.016.
The probability of an event, say E occurring is:

Here,
n (E) = favorable outcomes
N = total number of outcomes
Let X = the number of defective electric toothbrushes sold.
The number of electric toothbrushes that were delivered to a store is n = 20.
The number of defective electric toothbrushes is x = 3.
The number of ways to select two toothbrushes to sell from the 20 toothbrushes is:


The number of ways to select two defective toothbrushes to sell from the 3 defective toothbrushes is:


Compute the probability that the first two electric toothbrushes sold are defective as follows:
P (Selling 2 defective toothbrushes) = Favorable outcomes ÷ Total no. of outcomes

Thus, the probability that the first two electric toothbrushes sold are defective is 0.016.
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Answer:
25
Step-by-step explanation:
b the shapes are rectangele and triangele
c triangle base times hieght divided by 2 rectangele leingth times width
d rectangle- 3*5= 15
triangle 4*5=20 20/2=10
10+15=25
So you use the method FOIL
Front
Out
Inside
Last
So it would be
X^2-4x+3x-1
X^2-1x-1
So i think it’s -x
Answer: x = 20
Step-by-step explanation:
We can use the pythagorean theorem:
x^2 + 15^2 = 25^2
x^2 + 225 = 625
We can subtract 225 from both sides:
x^2 = 400
We can take the square root of both sides:
x = 20.
Answer:3
Step-by-step explanation: First you have to divide $109 and $4 which will give you 27.25 then you have to divide 27 with 7 which will give you 3 remainder 7 So, each of them have $3