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3 years ago

What's the answer for this? Explain

Mathematics

2 answers:

alexandr402 [8]3 years ago

6 0

Exterior angle is equal to sum of interior opposite angles hence,

req. angle = 80 + 62 = 142

Svetach [21]3 years ago

4 0

Since it is a angle on a straight line, it is basicly as simple as:

180-38=142 degrees

As there is space for half a circle above a straight line. :)

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Triangle MRN is created when an equilateral triangle is folded in half.

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The value of y based on the values given ib the equilateral triangle will be 4.

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From the information given, MN is one of the sides of the equilateral triangle. Therefore, side MR will be:

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In the above, it should be noted that MR was calculated since it's half of the value of MN which is 8.

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3 years ago

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student randomly receive 1 of 4 versions(A, B, C, D) of a math test. What is the probability that at least 3 of the 5 student te

alexdok [17]

Answer:

1.2%

Step-by-step explanation:

We are given that the students receive different versions of the math namely A, B, C and D.

So, the probability that a student receives version A = $\frac{1}{4}$ .

Thus, the probability that the student does not receive version A = $1-\frac{1}{4}$ = $\frac{3}{4}$ .

So, the possibilities that at-least 3 out of 5 students receive version A are,

1) 3 receives version A and 2 does not receive version A

2) 4 receives version A and 1 does not receive version A

3) All 5 students receive version A

Then the probability that at-least 3 out of 5 students receive version A is given by,

$\frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{3}{4}\times \frac{3}{4}$ + $\frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{3}{4}$ + $\frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}\times \frac{1}{4}$