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AlekseyPX
2 years ago
8

The sum of four and twice a number is 56. Find the number.​

Mathematics
2 answers:
kotegsom [21]2 years ago
5 0

Answer:

26

Step-by-step explanation:

4 + 2x = 56

2x = 56 - 4

x = 52/2

x = 26

kari74 [83]2 years ago
5 0

Answer:

26

Step-by-step explanation:

Let the missing number be x.

Given that,

→ Sum of four and twice a number is 56.

Let's form a equation,

→ 4 + 2x = 56

The required value of x will be,

→ 4 + 2x = 56

→ 2x = 56 - 4

→ 2x = 52

→ x = 52/2

→ [ x = 26 ]

Hence, the number is 26.

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

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

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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.

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A = a + (A \cap B)

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By the same logic, we have that:

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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.

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