8-3 + 4 = 8 - 7 = 1 Do you agree with Dora? Explain your answer.

Mathematics

2 answers:

grin007 [14]3 years ago

7 0

8-3+4=8-7=1

8-3+4=9

9-7= 2

no

Scorpion4ik [409]3 years ago

3 0

No. 8-3=5. 5+4 =9 . It is suppose to be 9 not 8! Next you would do 9-7 =2 not 1!!

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Answer:

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8. Is the following statement true or false? Justify your conclusion. If a and b are nonnegative real numbers and a + b =0, then

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Answer:

If $a + b = 0$ then $a = 0$ and $b =0$

a | b | a + b (answer)

0 | 0 | 0

0 | 1 | 1

0 | 2 | 2

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Step-by-step explanation:

Considering the following conditions for the real numbers:

$a\geq 0\\b\geq 0$

Following the rules of these in-equations, it is possible to deduce:

$a + b \geq 0$

Then, if the proposed statement is:

$a + b = 0$

The conditions above shall comply the requirements established, but first, analyzing the statement:

If $a \geq 0$ and $b \geq 0$ then $a + b \geq a$ , $a + b \geq b$ and $a + b \geq 0$ .

If $a = 0$ and b a non negative real number, then $a + b \geq b$ , but because to $a = 0$ , then $a + b = b$ . Due to the commutative property of sums, the same behavior will be presented if $b = 0$ and a a non negative real number.