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serious [3.7K]
3 years ago
6

A rectangular piece of paper measuring 25cm by 21cm is

Mathematics
2 answers:
timurjin [86]3 years ago
6 0
The surface area is the area of the rectangle - it has been rolled so no different.

25 x 21 = 525 cm^2
kvasek [131]3 years ago
4 0

The area of the piece of paper is (25cm x 21cm) =  525 cm² .

There's no reason it should change when you bend the paper
into different shapes.
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Eli's bedroom door is 9 feet tall and 3 feet wide. A new door is 2. 00 per square foot. How much would a new bedroom door cost i
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Answer: 54.00

Step-by-step explanation:

Door is 9 × 3= 27ft²

1ft² = 2.00

27ft²= 54.00

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2 years ago
Linda enrolls for 10 credit-hours for each of two semesters at a cost of $500 per credit-hour (tuition and fees). In addition, t
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3 years ago
20. Based on student records, 25% of the students at a large high school have a
Elenna [48]

Answer:

(E) 0.71

Step-by-step explanation:

Let's call A the event that a student has GPA of 3.5 or better, A' the event that a student has GPA lower than 3.5, B the event that a student is enrolled in at least one AP class and B' the event that a student is not taking any AP class.

So, the  probability that the student has a GPA lower than 3.5 and is not taking any AP  classes is calculated as:

P(A'∩B') = 1 - P(A∪B)

it means that the students that have a GPA lower than 3.5 and are not taking any AP  classes are the complement of the students that have a GPA of 3.5 of better or are enrolled in at least one AP class.

Therefore, P(A∪B) is equal to:

P(A∪B) = P(A) + P(B) - P(A∩B)

Where the probability P(A) that a student has GPA of 3.5 or better is 0.25, the probability P(B) that a student is enrolled in at least one AP class is 0.16 and the probability P(A∩B) that a student has a GPA of 3.5 or better and is enrolled  in at least one AP class is 0.12

So, P(A∪B) is equal to:

P(A∪B) = P(A) + P(B) - P(A∩B)

P(A∪B) = 0.25 + 0.16 - 0.12

P(A∪B) = 0.29

Finally, P(A'∩B') is equal to:

P(A'∩B') = 1 - P(A∪B)

P(A'∩B') = 1 - 0.29

P(A'∩B') = 0.71

5 0
3 years ago
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The diagram shows the intersections of several straight roads. The avenues run parallel to each other.
Harlamova29_29 [7]

Answer:

The answer is B: 226 ft

Step-by-step explanation:

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3 years ago
Evaluate x+3y when x=2, y-3
AlekseyPX

Answer:

-7

Step-by-step explanation:

x+3y

Let x =2 and y = -3

2 +3(-3)

2 -9

-7

6 0
4 years ago
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