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joja [24]
2 years ago
7

Can someone help me out? :)

Mathematics
2 answers:
cestrela7 [59]2 years ago
7 0

Answer:

X = 8

Step-by-step explanation:

ddd [48]2 years ago
3 0

Answer:

x=2

Step-by-step explanation:

9 x 5= 45

55-45=10

10/5=2

x=2

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A track star runs two races on a certain day. The probability thathe wins the first race is 0.7, the probability that he wins th
NARA [144]

Answer:

a) 80% probability that he wins at least one race.

b) 30% probability that he wins exactly one race.

c) 20% probability that he wins neither race.

Step-by-step explanation:

We solve this problem building the Venn's diagram of these probabilities.

I am going to say that:

A is the probability that he wins the first race.

B is the probability that he wins the second race.

C is the probability that he does not win any of these races.

We have that:

A = a + (A \cap B)

In which a is the probability that he wins the first race but not the second and A \cap B is the probability that he wins both these races.

By the same logic, we have that:

B = b + (A \cap B)

The probability that he wins both races is 0.5.

This means that A \cap B = 0.5

The probability that he wins the second race is 0.6

This means that B = 0.6

B = b + (A \cap B)

0.6 = b + 0.5

b = 0.1

The probability that he wins the first race is 0.7.

This means that A = 0.6

A = a + (A \cap B)

0.7 = a + 0.5

a = 0.2

A) he wins at least one race.

This is

P = a + b + (A \cap B) = 0.2 + 0.1 + 0.5 = 0.8

There is an 80% probability that he wins at least one race.

B) he wins exactly one race.

This is

P = a + b = 0.2 + 0.1 = 0.3

There is a 30% probability that he wins exactly one race.

C) he wins neither race

Either he wins at least one race, or he wins neither. The sum of these probabilities is 100%.

From a), we have that there is an 80% probability that he wins at least one race.

So there is a 100-80 = 20% probability that he wins neither race.

6 0
3 years ago
1 meter is times as long as 1 decimeter
anzhelika [568]

Answer:

10

Step-by-step explanation:

4 0
3 years ago
Can some one help me set up an equation out of these word problems? PLEASE HELP!!!
Elanso [62]
1: 2/5=emails 3.6hrs=emails, 3.6=2/5 5-2=3 3.6•3=__hours of work

2. 294+83=$__

3. 3•x=hw 64/4=__•3=__hrs on math

4. Idk sorry


Sorry if some of these are wrong but I'm pretty sure there right.
5 0
2 years ago
Read 2 more answers
Write each product using an exponent: example 6x6==
swat32
Since 6x6 equals 36, then 6² would be the exponent because 6² is the same as 6x6
3 0
2 years ago
-2(x – 3) - 2<br> simplify the expression
Inessa [10]

Answer:

-2x+4

Step-by-step explanation:

-2(x-3)-2

-2x+6-2

-2x+4

4 0
2 years ago
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