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BlackZzzverrR [31]
3 years ago
14

Can someone help me do this with working pls

Mathematics
1 answer:
ycow [4]3 years ago
4 0
∵ the two triangles are congruent

AB / AD = BC / DE
8/4 = 6/ DE
DE = 6 x 3 ÷ 8 = 3 cm
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I need help pls help
Sauron [17]

Answer:

I could be wrong, but I think it's D

8 0
3 years ago
) An instructor gives his class a set of 18 problems with the information that the next quiz will consist of a random selection
RSB [31]

Answer:

The probability the he or she will answer correctly is 1.5%

Step-by-step explanation:

In all, there are 18 problems. In this question, the order of which the problems are sorted for the quiz makes no difference. For example, if the question A of the quiz is P1 and question B P2, and question A P2 and question B P1, it is the same thing.

There are 18 problems and 9 are going to be selected. So, there is going to be a combination of 9 elements from a set of 18 elements.

A combination of n elements from a set of m objects has the following formula:

C_{(m,n)} = \frac{m!}{n!(m-n)!}

In this question, m = 18, n = 9. So the total number of possibilities is:

T_{p} = C_{(18,9)} = \frac{18!}{9!(18-9)!} = 48620

Now we have to calculate the number of desired outcomes. This number is a combination of 9 elements from a set of 13 elements(13 is the number of problems that the student has figured out how to do).

Now, m = 13, n = 9. The number of desired possibilities is:

D_{p} = C_{(13,9)} = \frac{13!}{9!(13-9)!} = 715

The probability is the number of desired possibilities divided by the number of total possibilities. So

P = \frac{715}{48620} = 0.015 = 1.5%

The probability the he or she will answer correctly is 1.5%

3 0
3 years ago
Question and choices Are below
Vika [28.1K]

Answer:

9ft

Step-by-step explanation:

Use the pythagorean theorem.

15^2 = 12^2 + x^2

solve for x

x^2 = 81

x = 9

7 0
2 years ago
sean lives about 15.5 miles from the airport which number rounds to 15.5 when ronded to nearest tenth
goldfiish [28.3K]

16.0Answer:

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
in priyas math class there are 10 boys and 15 girls. What is the ratio of boys to girls in priyas math class? express your answe
Helen [10]

Answer:

2:3 , you divide by common denominator

i guess as a decimal it might be

.50 to .75 but dont take my word for it

Step-by-step explanation:

10 into 5 is 2

15 into 5 is 3

5 0
3 years ago
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