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liberstina [14]
3 years ago
6

You forgot the last two digits of your friends phone number. You know that the next to last digit is 4 or 5, and the last digit

is an odd number. If you guess the phone number what is the probability that you will be correct?
Mathematics
2 answers:
Irina18 [472]3 years ago
7 0
If you did the math right there is a 90% sure that you have got it right and a 10% that you have not
ehidna [41]3 years ago
4 0

Answer:

1/10 or 10%

Step-by-step explanation:

There are a total of five odd digits we can use (1,3,5,7,9). And we know the second to last digit is a four or a five. That means there is a total of 10 combinations (5 for each secondary digit). A guess would give you one of those ten combinations. Giving you a probability of 1/10 or 10%.

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So you can use the special formula for 30-60-90 triangle or you can use the whole Soh Cah Toa thing.

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sin(30 deg)=a/12

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Oduct of (x2 + 3)(x - 5).
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Answer: 2x^2-7x-15

Step-by-step explanation:

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8 0
3 years ago
The curved urface area of a cone i 140π cm2. What will be the radiu of a cone whoe lant height i 5 cm
VashaNatasha [74]

The radius of a cone with a curved surface area of 140π cm² and a slant height of 5 cm will be 28 cm.

<h3>What is curved surface area?</h3>

The region with just curved surfaces, leaving the circular top and base, is referred to as the curved surface area. Total Surface Area is the combined area of the bases and the curved surface. The measurement of a solid's curved surface area is its outer area, which excludes the top and bottom extensions. Surface area of the cylinder that is curved: A right circular cylinder is the solid that results when a rectangle circles around one side and makes a full revolution. The curved surface area of a cylinder (CSA) is also known as the lateral surface area and is defined as the area of the curved surface of any given cylinder having a base radius "r" and height "h".

Here,

Curved surface area of cone=πrl

=140π

l=5 cm

140π=πr*5

r=140/5

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The radius of cone that has 5 cm as slant height and 140π cm² as the curved surface area will be 28 cm.

To know more about curved surface area,

brainly.com/question/1037971

#SPJ4

7 0
1 year ago
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