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gavmur [86]
3 years ago
7

USE MENTAL MATH TO ADD. 136+43​

Mathematics
2 answers:
horsena [70]3 years ago
6 0

Answer:

179

Step-by-step explanation:

just look at the question and do 6 + 3 = 9 (for the ones place)

and 3 + 4 = 7 (for the tens place)

add 1 to the beginning of the answer for 100 (hundreds place)

iris [78.8K]3 years ago
3 0

Answer:

179

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

(5)(−2)−(21−(3−11)(−2))

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Preethi writes fifteen 1s in a row and randomly writes + and - between each pair of consecutive 1s. Find the probability that th
amid [387]

Answer:

The probability that the expression Preeti wrote has the value 7 cannot be easily determined.

Step-by-step explanation:

Given that Preeti writes

111111111111111,

then randomly writes + and - between each pair of consecutive 1's.

It is not specified that the + and - signs are written to be alternating, they are said to be just 'random'. So, there are a lot of possibilities. Things like:

1+1-1+1+1-1+1-1-1-1+1+1-1+1-1 = 1

Or

1-1-1+1+1-1-1+1+1-1+1-1+1+1-1 = -1

Or

1-1+1-1-1+1-1+1+1-1-1+1-1+1+1 = 0

And so on. There is a lot of possibilities.

So, clearly, the probability is difficult to determine, as the expression Preeti wrote could have had the value 7 in many different forms.

Because:

1+1+1+1+1+1+1-1+1-1+1-1+1-1+1 = 7

1+1+1+1-1-1-1-1-1+1-1-1-1+1+1 = 7

And many more.

Therefore, the probability that the expression Preeti wrote has the value 7 cannot be easily determined.

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