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2 years ago

1+1 =? I'm not sure need help

Mathematics

2 answers:

Harlamova29_29 [7]2 years ago

8 0

Answer:

Step-by-step explanation: are you 3

yulyashka [42]2 years ago

3 0

Answer:

Step-by-step explanation:

this is becuase adding 1 unit to another unit will equal 2

example: if you had one orange, and were given a second orange, then you now have two oranges

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Which property is shown in the following statement?

dusya [7]

Answer:

Step-by-step explanation:

Identity property of multiplication: Any number times 1 (unity) is the number itself. 7 times 1 is 7, the number with which we started.

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3 years ago

Washer B can wash 144 loads in 3 days. At this rate, how many loads can Washer B wash in 10 days?

sineoko [7]

The answer is 480 because 144/3 is 48. You multiply 48 and 10 to get 480

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3 years ago

What is the answer to 20(x + 1) = 200

patriot [66]

Answer:

x = 9

Step-by-step explanation:

20x + 20 = 200

-20 -20

20x. = 180

x = 9

6 0

3 years ago

Read 2 more answers

Determine all prime numbers a, b and c for which the expression a ^ 2 + b ^ 2 + c ^ 2 - 1 is a perfect square .

kogti [31]

Answer:

The family of all prime numbers such that $a^{2} + b^{2} + c^{2} -1$ is a perfect square is represented by the following solution:

$a$ is an arbitrary prime number. (1)

$b = \sqrt{1 + 2\cdot a \cdot c}$ (2)

$c$ is another arbitrary prime number. (3)

Step-by-step explanation:

From Algebra we know that a second order polynomial is a perfect square if and only if $(x+y)^{2} = x^{2} + 2\cdot x\cdot y + y^{2}$ . From statement, we must fulfill the following identity:

$a^{2} + b^{2} + c^{2} - 1 = x^{2} + 2\cdot x\cdot y + y^{2}$

By Associative and Commutative properties, we can reorganize the expression as follows:

$a^{2} + (b^{2}-1) + c^{2} = x^{2} + 2\cdot x \cdot y + y^{2}$ (1)

Then, we have the following system of equations:

$x = a$ (2)

$(b^{2}-1) = 2\cdot x\cdot y$ (3)

$y = c$ (4)

By (2) and (4) in (3), we have the following expression:

$(b^{2} - 1) = 2\cdot a \cdot c$

$b^{2} = 1 + 2\cdot a \cdot c$

$b = \sqrt{1 + 2\cdot a\cdot c}$

From Number Theory, we remember that a number is prime if and only if is divisible both by 1 and by itself. Then, $a, b, c > 1$ . If $a$ , $b$ and $c$ are prime numbers, then $2\cdot a\cdot c$ must be an even composite number, which means that $a$ and $c$ can be either both odd numbers or a even number and a odd number. In the family of prime numbers, the only even number is 2.