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g100num [7]
3 years ago
6

A test consists of 10 multiple choice questions, each with five possible answers, one ofwhich is correct. To pass the test a stu

dent must get 70% or better on the test. If a studentrandomly guesses, what is the probability that the student will pass the test?
Mathematics
1 answer:
const2013 [10]3 years ago
7 0

Answer:

40%-50%

Step-by-step explanation:

Because they are guessing and might fail half of the test or more.

I hope this helps

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Adena, Julius, and Tia volunteered to read to children at the public library. Julius worked two hours less than Tia. Adena worke
mafiozo [28]

Answer:

28 hours

Step-by-step explanation:

Adena, Julius, and Tia volunteered to read to children at the public library.

Let us represent, the number of hours worked by

Adena = x

Julius = y

Tia = z

Julius worked two hours less than Tia.

y = z - 2

z = y + 2

Adena worked twice as many hours as Julius.

x = 2y

Altogether they worked 58 hours.

x + y + z = 58.... Equation 1

We substitute 2y for x and y + 2 for z in Equation 1

2y + y + y + 2 = 58

4y + 2 = 58

Collect like terms

4y = 58 - 2

4y = 56

y = 56/4

y = 14

We are the find the number of hours Adena worked which is represented by x

Note that:

x = 2y

y = 14, hence,

x = 2 × 14

x = 28 hours

Therefore, the number of hours Adena worked is 28 hours

4 0
2 years ago
Which one should I choose
Sveta_85 [38]
Answer C or the third one
8 0
3 years ago
I need help! I have 0 idea how to get the answer or anything
rjkz [21]

Answer:

2x +110= 180

2x=70

x=35

Step-by-step explanation:

5 0
2 years ago
In an ellipse, the ratio of the distance between the foci and the length of the major axis is called:
Anni [7]

The ratio of the distance between the foci and the length of the <em>major</em> axis is called eccentricity.

<h3>Definitions of dimensions in ellipses</h3>

Dimensionally speaking, an ellipse is characterized by three variables:

  1. Length of the <em>major</em> semiaxis (a).
  2. Length of the <em>minor</em> semiaxis (b).
  3. Distance between the foci and the center of the ellipse (c).

And there is the following relationship:

c = \sqrt{a^{2}-b^{2}} (1)

Another variable that measure how "similar" is an ellipse to a circle is the eccentricity (e), which is defined by the following formula:

e = \frac{c}{a}, 0 \ge c \ge 1 (2)

The greater the eccentricity, the more similar the ellipse to a circle.

Therefore, the ratio of the distance between the foci and the length of the <em>major</em> axis is called eccentricity. \blacksquare

To learn more on ellipses, we kindly invite to check this verified question: brainly.com/question/19507943

3 0
2 years ago
What do you add to 4 7/8 to make 8
nekit [7.7K]

Answer:

3 1/8

Step-by-step explanation:

4+3=7

7/8+1/8= 1

7+1=8

6 0
3 years ago
Read 2 more answers
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