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Klio2033 [76]
3 years ago
15

There are 10 light bulbs in a bag. Two are defective. Select a light bulb. What is the probability of selecting a light bulb tha

t is not defective?
Mathematics
2 answers:
-BARSIC- [3]3 years ago
8 0
The answer would be 8 out of 10
ValentinkaMS [17]3 years ago
5 0
8 out of ten bulbs are not defective.
Therefore the probability is 8/10
This can be simplified to 4/5 or 0.8 or 80%
- depending on your format
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You are making 10 tons of concrete that is 37.9% cement by mixing a 25% cement mixture with a 68% cement mixture.
Mnenie [13.5K]
The 10 tons should have 37.9% cement.

Let the 25% mixture be x tons

Then the 68% mixture will be (10 -x) tons.

Using formula for mixtures:
Let p for percentage and w for weight in tons.

p₁w₁ + p₂w₂ = pw

25*x + 68*(10-x) = 37.9*10

25x + 680 - 68x = 379

680 - 43x = 379

680 - 379 = 43x

301 = 43x

43x = 301

x = 301/43

x = 7

Recall that x, was for the 25% mixture, 7 tons.

a) For the 68% mixture, = 10 - x = 10 -7 = 3 tons.

b) For the 25% mixture = x = 7 tons.  
6 0
3 years ago
Factor the gcf -5k^2+20k-30
Degger [83]
Everything is divisible by five, so pull out five

5(-k^2+4k-6)
8 0
4 years ago
What's the circumference of a
grandymaker [24]

Answer:

56.55 inches

Step-by-step explanation:

8 0
3 years ago
The owner of a retail store is tracking his inventory for an annual report. The graph shows the remaining inventory for a partic
aliina [53]
Y = -2.8x +69.4

Let y represent units of inventory, and x represent days since the last replenishment. We are given points (x, y) = (3, 61) and (13, 33). The line through these points can be described using the 2-point form of the equation of a line:
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Filling in the given point values, we have ...
... y -61 = (33 -61)/(13 -3)(x -3)
Simplifying and adding 61, we get ...
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5 0
3 years ago
the function b(n)=12n represents the number of baseballs b(n) that are needed for n games how many baseballs are needed for 15 g
Natasha2012 [34]
<span>180 n is the number of games. In this case it is 15. Enter this number into the function: b(n) = 12n = 12(15) = 180. Simply put, 12 balls are needed for each game. 15 x 12 = 180</span>
8 0
3 years ago
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