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2 years ago

If you subtract 16 from my number and multiply the difference by -7, the result is -154 What is my number

Mathematics

1 answer:

adell [148]2 years ago

7 0

Answer:

16-x*(-7)=-154

7x =-154-16

7x/7=-170/7

X=-24.29

Step-by-step explanation:

Let x represent "my number"

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The answer I think it would be -6 right?

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The area of a square patch of grass is 25 square meters .how long is each side of the patch

77julia77 [94]

The area of a square with sides of length s is

A=s^2, and we are told A=25 so

s^2=25

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Let A be a set of numbers.

LUCKY_DIMON [66]

Answer:

a. closed under addition and multiplication

b. not closed under addition but closed under multiplication.

c. not closed under addition and multiplication

d. closed under addition and multiplication

e. not closed under addition but closed under multiplication

Step-by-step explanation:

Let A be a set of all integers divisible by 5.

Let $x,y$ ∈A such that $x=5m\,,\,y=5n$

Find $x+y,xy$

$x+y=5m+5n=5(m+n)$

So, $x+y$ is divisible by 5.

$xy=(5m)(5n)=25mn=5(5mn)$

So,

$xy$ is divisible by 5.

Therefore, A is closed under addition and multiplication.

Let A = { 2n +1 | n ∈ Z}

Let $x,y$ ∈A such that $x=2m+1\,,\,y=2n+1$ where m, n ∈ Z.

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So,

$x+y$ ∉ A

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$xy$ ∈ A

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$xy=2(5)=10$ ∉A

Therefore, A is not closed under addition and multiplication.

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$x+y=17n+17m=17(n+m)$

$xy=(17m)(17n)=289mn=17(17mn)$

So,

$x+y,xy$ ∈ A

Therefore, A is closed under addition and multiplication.

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Let $x,y$ ∈ A such that $x=-1,y=1$

Find x + y

$x+y=-1+1=0$

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$x+y$ ∈ A

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