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3 years ago

9

A wooden plank of length x is cut into 8 sections such that each section is at most 2 1/2 meters long. What is the length of the

entire plank in meters

1 answer:

Arisa [49]3 years ago

7 0

You would do 2.5*8 which equals 20. x=20

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There are 5 questions on a multiple choice exam, each with five possible answers. If a student guesses on all five questions, wh

Mrac [35]

Answer:

$20.5\%$

Step-by-step explanation:

Let's write out a case for two specific questions being correct and the rest being incorrect:

$\frac{1}{5}\cdot \frac{1}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}$ ,

The $\frac{1}{5}$ represents the chances of getting the question correct, as there are 5 answers and 1 correct answer choice.

The $\frac{4}{5}$ represents the chances of getting the question incorrect, as there are 5 answers and 4 incorrect answer choices.

The equation above does show the student getting two answers correct and three answers incorrect, but it only shows one possible case of doing so.

We can choose any two of the five questions to be the ones the student gets correct. Therefore, we need to multiply this equation by the number ways we can choose 2 from 5 (order doesn't matter): $\binom{5}{2}=10$ .

Therefore, the probability the student gets two questions correct is:

$\frac{1}{5}\cdot \frac{1}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}\cdot \binom{5}{2}=\frac{1}{5}\cdot \frac{1}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}\cdot 10=0.2048\approx \boxed{20.5\%}$

6 0

3 years ago

''This graph shows parabola y=ax^2+bx+c. What is the possible value of a?''

aliya0001 [1]

I’m not 100% sure so sorry if it’s wrong but I think it’s 3/2

8 0

3 years ago

What are the coordinates of the pre-image of N' if it was reflected across the y-axis, and N' has coordinates (3, -1)? Please ex

borishaifa [10]

The answer would be (3,-1) because it is reflected

6 0

3 years ago

The area of a trapezium is 35 cm² and the distance between its parallel sides is 16 cm. if one of the parallel is of length 25 c

Furkat [3]

Answer:

No solution

Step-by-step explanation:

A = (b1 + b2)h/2

A = 35 cm²

h = 16 cm

b1 = 25 cm

b2 = ?

35 = (25 + b2)(16)/2

70 = (25 + b2)(16)

70 = 400 + 16b2

16b2 = 330

b2 = 330/16 = -20.625

The answer is a negative number. Since the base of a trapezium cannot have a negative length, there does not exist a trapezium with the given information.

3 0

3 years ago

What does the point (4,60) represent in go math books page 131 about bicyclist traveling

mafiozo [28]

Answer:

could you show the mathbook page

Step-by-step explanation:

6 0

3 years ago