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Anna71 [15]
3 years ago
7

Explain how knowing 1+7 helps you find the sum for 7+1

Mathematics
2 answers:
nasty-shy [4]3 years ago
7 0
Because it is just backwards 1+7=8 and 7+1=8 so that why
AlekseyPX3 years ago
6 0

Answer:

Using communicative property.

Step-by-step explanation:

We are given to find the sum for 7+1 using 1+7.

Here we will use communicative property of addition.

Property says:  a + b = b + a

Result of a+b would be equivalent to b+a.

Now we apply this property into our question.

Using communicative property we can write 1+7 is equivalent to 7+1

So, If we know the result of 1+7 then find the sum 7+1.

Therefore, sum of 1 +7 = 8  = 7+1

Thus, Using communicative property.

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Look at the rectangle and the square:
OlgaM077 [116]

Answer:

Sam is incorrect

Step-by-step explanation:

We can calculate the lengths of the diagonals using Pythagoras' identity.

The diagonals divide the rectangle and square into 2 right triangles.

Consider Δ SRQ from the rectangle

SQ² = SR² + RQ² = 12² + 6² = 144 + 36 = 180 ( take square root of both sides )

SQ = \sqrt{180} ≈ 13.4 in ( to 1 dec. place )

Consider Δ ONM from the square

OM² = ON² + NM² = 6² + 6² = 36 + 36 = 72 ( take square root of both sides )

OM = \sqrt{72} ≈ 8.5 in ( to 1 dec. place )

Now 2 × OM = 2 × 8.5 = 17 ≠ 13.4

Then diagonal OM is not twice the length of diagonal SQ

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3 years ago
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Nostrana [21]

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6 0
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Sqrt x-3+5=x ?? Help
kolezko [41]
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6 0
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−3x + 7y = −16<br>−9x + 5y = 16<br><br>solve using elimination
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6 0
3 years ago
Savannah got her hair done. If it costs $120 and she tips her hairdresser 18%, how much tip will her hairdresser receive
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Answer:

21.6

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