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3 years ago

Help me PLEASE ITS 7TH GRADE MATH I NEED HELP PLEASE ITS SO LATE AT NIGHT AND IM TIRED

Mathematics

2 answers:

Mariulka [41]3 years ago

8 0

The answer for the one below the first one, k = 2/18

djverab [1.8K]3 years ago

4 0

Answer:

s/10 = c

Step-by-step explanation:

its for the one on the top right, ill update this as i go through

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Solve the system by substitution -x - y - z= -8 -4x + 4y + 5z = 7 2x + 2z = 4

Stella [2.4K]

First:

2x + 2z = 4

2(x+z)=4

x+z=4/2

x=2-z

-x - y - z= -8

-(2-z)-y-z= -8 replace x

-2+z-y-z= -8 (cancel z)

-2-y= -8

6 = y

Then:

-4x + 4y + 5z = 7 replace x and y

-4(2-z)+4*6 + 5z = 7

-8 + 4z + 24 + 5z = 7

16 + 9z = 7

9z = 7 - 16

9z = -9

z = -9/9

z= -1

Finally

x= 2-z replace z

x = 2- (-1)

x = 3

5 0

3 years ago

4x-5(-3) Help plzzzzzz

kaheart [24]

Answer:

4x-15

Step-by-step explanation

You just multiply -5 and -3 to simplify this.

7 0

3 years ago

What is 13 nickels combined with 6 dimes?

Setler [38]

125 = 6 dimes = 60 and 13 nickles = 65

60+65= 125

Hope i was the brainliest asnwer.

6 0

3 years ago

What is the product?(4x)(-3x^8)(-7^3)

kicyunya [14]

Answer:

4116x^9

Step-by-step explanation:

(4x)(-3x^8)(-7^3)

(-12x^9)(-343)

4116x^9

7 0

3 years ago

The square root of a negative number, such as StartRoot negative 144 EndRoot, is undefined. Explain why the square root of –x, S

IRINA_888 [86]

Answer:

see the explanation

Step-by-step explanation:

we have

$f(x)=\sqrt{-x}$

we know that

The radicand of the function cannot be a negative number

$-x\geq 0$

Solve for x

Multiply by -1 both sides

$x\leq 0$

The domain of the function f(x) is the interval -----> (-∞, 0]

The domain is all real numbers less than or equal to zero

The range of the function f(x) is the interval ----> [0,∞)

The range is all real numbers greater than or equal to zero

Example

For x=144

$144\leq 0$ ----> is not true

This value of x not satisfy the domain

substitute

$f(x)=\sqrt{-144}$ ----> this value is undefined

For x=-144

$-144\leq 0$ ----> is true

This value of x satisfy the domain

substitute

$f(x)=\sqrt{-(-144)}$

$f(x)=\sqrt{144}$ ----> this value is defined

therefore

The function will be undefined for all those values of x that do not belong to the interval of the domain of the function

6 0

3 years ago

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