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SVETLANKA909090 [29]
3 years ago
15

When combining like terms what is -7x - 6x?

Mathematics
2 answers:
Sati [7]3 years ago
5 0

Answer:

Question 1

3y; y+y+y

3y = 3(2) = 6

y+y+y = 2+2+2 = 6

anwser: They are both 6.

Question 3

2z+3z

answer:  5z

part 2

2z+3z

Evaluate the expression when z=7.

2(7)+3(7) = 14 + 21 = 35

Question 4

Consider the expressions 6x and 3(x+2).

Evaluate each expression for x=2.

6x = 6(2) = 12

3(x+2) = 3(2+2) = 3*4=12

answer: 

The expressions are not equivalent, but the answers are the same when x=2.

Question 7

Select all the statements that are true.

_F__ 116b is equivalent to 16b.

_F__ 14b+13b is equivalent to 27b.

__F_ 13(b+7) is equivalent to 13b+73.

_T__ b+0.3+4b is equivalent to 5b+0.3.

Question 8

Select all the statements that explain why 7x+2x and 4x+5x both equal 18 when x=2.

7x+2x = 7(2) + 2(2) = 14 +4 =18  .......(9x)

and

4x+5x 4(2) +5(2) = 8+10 =18 .....(9x)

Answer:

___ Both expressions simplify to 9x when like terms are combined.

___ The expressions are equivalent, because when you combine like terms in each, the result is the same.

Question 10

Consider the expressions 2(x+2) and 2x+2.

Evaluate each expression for x=4.

 2(x+2) = 2(4+2) = 12  ..................(2x+4)

 2x+2= 2(4)+2 = 10  ......................(2x+2)

Step-by-step explanation:

11111nata11111 [884]3 years ago
3 0

Answer:

-13x

Step-by-step explanation:

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The point (-4,-2) is reflected across the x-axis
lesantik [10]

When you have to reflect across the x-axis, you have to change the sign of the number in the (y).


(-4,-2) reflected over the x -axis becomes (-4, 2)


(-4, 2) is your answer



hope this helps

8 0
3 years ago
PLS PLS PLS HELP ME...​
viktelen [127]

Answer:

10

Step-by-step explanation:

Take the bottom number from the smaller triangle and multiply by 10 (just like they did for the 3 which is how they turned it into 15)

5 0
2 years ago
Read 2 more answers
What is the vertex of the parabola given by the equation y x^2+ 4?
max2010maxim [7]

Format of Quadratic Equation:  y = ax2 + bx + c

Given Quadratic Equation:  y = 2x2 - 3x + 3

Coefficient Variable Values:  a = 2 and b = -3 and c = 3

Axis of Symmetry:  x = -b/2a = -(-3)/2(2) so answer is x = 3/4

Vertex:  x value is axis of symmetry (3/4) and y value is calculated substituting 3/4 for x in original equation:  y = 2(3/4)2 - 3(3/4) + 3 = 2(9/16) - 9/4 + 3 = 9/8 - 9/4 + 3 = 9/8 - 18/8 + 24/8 = 15/8,
so answer is (3/4,15/8)

x intercepts (solve using quadratic formula):  x = (-b plus or minus sqrt(b2 - 4ac)/2a, so plugging in coefficient values for a and b and c, we get x = [-(-3) plus or minus sqrt((-3)2 - 4(2)(-3)]/2(2), which results in x = (3 + sqrt(33))/4 or (3 - sqrt(33))/4 and answers to nearest tenth are x = (3 + 5.7) / 4 = 2.2
or x = (3 - 5.7) / 4 = -0.7

y intercept is calculated by substituting zero for x into original equation:  y = 2x2 - 3x + 3, so y-intercept is 3.

Domain is range is from calculated negative x intercept (-0.7) to calculated positive x intercept (2.2) and is written as (-0.7,2.2)

Range is from calculated y-intercept to positive infinity, since parabola opens up due to positive x2 coefficient value, so range is written as (3,positive infinity).  Note:  infinity symbol is sideways 8.         

4 0
3 years ago
Read 2 more answers
Which expression equals the sum 1+2+3+4+5+6..
otez555 [7]

Answer:

7 * 3

7+7+7

3+3+3+3+3+3+3

2+2+2+2+2+2+2+2+2+2+1

(2*10)+1

(10*1)+11....

...and so on

Step-by-step explanation:

I don't know what type of expression you are looking for

7 0
2 years ago
Is 3.222222 a rational number
SIZIF [17.4K]

Answer:

<h2>YES</h2>

Step-by-step explanation:

If the number is rational, I can write it as a fraction in which the numerator and denominator are integers (denominator other than 0).

3.\underbrace{222222}_{6}=\dfrac{3222222}{1\underbrace{000000}_6}-\bold{RATIONAL}

If is repeating:

x=3.2222....       <em>multiply both sides by 10</em>

10x=32.2222...      <em>    make the difference 10x - x</em>

10x-x=32.2222...-3.2222...

9x=29             <em>divide both sides by 9</em>

x=\dfrac{29}{9}-\bold{RATIONAL}

4 0
3 years ago
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