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Verizon [17]
3 years ago
7

My teacher said that 9+10 could equal 21 TELL me how

Mathematics
2 answers:
AlladinOne [14]3 years ago
3 0
Proof:
9+10=?
9 = 3x3
10= 5x2
3 (from 3x3) x 5 (from 5x2) = 15
3 (from 3x3) x 2 (from 5x2) = 6
15+6=21
Therefore 9+10=21

21 CONFIRMED
Georgia [21]3 years ago
3 0
9+10=21 because you think different
3 times 3 equals 9
5 times 2 equals 10
multiply these t=numbers then add then you get 21

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Option B:

The expression equivalent to |a| ≤ 5 is a ≥ -5 and a ≤ 5.

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Given expression: |a| \leq 5

To find the equivalent expression for the given expression.

Apply absolute value rule:

<em>If |x| ≤ m  then -m ≤ x ≤ m.</em>

|a| \leq 5

⇒ -5 ≤ a ≤ 5

⇒ -5 ≤ a and a ≤ 5

Switch the sides, we get

⇒ a ≥ -5 and a ≤ 5

The expression equivalent to |a| ≤ 5 is a ≥ -5 and a ≤ 5.

Option B is the correct answer.

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