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3 years ago

Are composite numbers closed under multiplication

Mathematics

1 answer:

MrMuchimi3 years ago

3 0

Answer:

Remember that for a subset of a ring to be an ideal it must be closed under addition and under taking multiples by elements of the ring, and in this case the set of all composite integers is not closed under addition.

Step-by-step explanation:

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The difference of three times a number and 3.5

Annette [7]

The equation is 3x-3.5=y

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3 years ago

True or false Please

nevsk [136]

respuesta:primero verdadero

segundo : no

7 0

3 years ago

Which number is a solution of the equality

dexar [7]

Answer:

Step-by-step explanation:

Given

3x - 15 ≥ 3 ( add 15 to both sides )

3x ≥ 18 ( divide both sides by 3 )

x ≥ 6

Since x is greater than or equal to 6 then 6 is a solution

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3 years ago

Read 2 more answers

A rectangular piece of cardboard is 15 inches longer than it is wide. A 5-inch square is cut from each corner, and the remaining

HACTEHA [7]

Let x be the width of the cardboard, then the length is x+15. If 5 unches square is cut from each corner, then the new length is x+15-5·2=x+5 and the new width is x-5·2=x-10. The height of the formed box is 5 in. Now you can find the box volume:

$V=\text{ width }\cdot \text{ length }\cdot \text{ height },\\ V=(x-10)\cdot (x+5)\cdot 5,\\ V=5(x^2-5x-50)$ .

If the volume of the box is 1,250 cubic inches, then

$5(x^2-5x-50)=1250,\\ x^2-5x-50=250,\\ x^2-5x-300=0,\\ D=(-5)^2-4\cdot (-300)=25+1200=1225,\\ \sqrt{D} =35,\\ x_{1,2}=\dfrac{5\pm 35}{2} =20,-15$ .

The length of the box is x+5=20+5=25 in. (the negative x is extra, because the length couldn't be negative).

Answer: the length of the box is 25 inches.

7 0

3 years ago

Line / is parallel to line m. The slope of line / is 2/7. What is the slope of line M ?

Ray Of Light [21]

Answer:

The slope would also be 2/7.

Step-by-step explanation:

The two lines are parallel, meaning that they follow the same slope. If line / has a slope of 2/7, then line M must have the same slope as well. I hope this helps! :)

6 0

2 years ago