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Mariana [72]
2 years ago
7

Write the algebraic expression to represent the following: Twice a number n decrease by 7.

Mathematics
2 answers:
Shkiper50 [21]2 years ago
3 0

Answer:

2n-7

Step-by-step explanation:

Ulleksa [173]2 years ago
3 0

Answer:

2n-7

Step-by-step explanation:

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In a group of 42 students, 9 study both Art and Biology.
LUCKY_DIMON [66]
Answer:
The probability the student studies Art and
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Step-by-step explanation:
Denote the events as follows:
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B= a students studies Biology
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N = 42
n (An B) = 9
n (A' n B) = 10
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n(An B') = N -n (An B) -n (A' nB) - n (A'n B')
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