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astraxan [27]
3 years ago
6

NEED HELP!! Please help really hard for me because i´m dumb sometimes.

Mathematics
2 answers:
ivanzaharov [21]3 years ago
7 0

Answer: It is C. None of the above

xenn [34]3 years ago
7 0

Answer: It is C. None of the above

Step-by-step explanation:

B. you're adding 1.5 when you should be subtracting it

A. two negatives make a positive so you would be adding

*again you should be subtracting*

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5 ( n - 7 ) = 2 ( n + 14 )
wariber [46]

Answer:

n=21

Step-by-step explanation:

We must find n.

Remember PEMDAS. First we must do the Parentheses. Lets do distributive property by multiplying a number that is immediately outside the parentheses with each number inside the parentheses. Lets do this one side at a time.

First lets do 5(n - 7). We get 5n - 35

Now 2(n + 14) is 2n + 28

Okay...... now we have 5n-35=2n+28

Now lets do OPPOSITES!!!! We must do the opposite of each thing to both sides.

The opposite of -35 is positive 35. Lets add 35 to both sides. We get:

5n=2n+63

Now lets do the opposite of 2n which is -2n

3n=63

this is looking quite nice isnt it..........

The opposite of 3 times n is 3 DIVIDED BY n. So lets divide both sides by 3

n=21

amazing.......

8 0
3 years ago
Read 2 more answers
(PLEASE HELP ASAP)
UNO [17]

9514 1404 393

Answer:

  A. 3×3

  B. [0, 1, 5]

  C. (rows, columns) = (# equations, # variables) for matrix A; vector x remains unchanged; vector b has a row for each equation.

Step-by-step explanation:

A. The matrix A has a row for each equation and a column for each variable. The entries in each column of a given row are the coefficients of the corresponding variable in the equation the row represents. If the variable is missing, its coefficient is zero.

This system of equations has 3 equations in 3 variables, so matrix A has dimensions ...

  A dimensions = (rows, columns) = (# equations, # variables) = (3, 3)

Matrix A is 3×3.

__

B. The second row of A represents the second equation:

  0x_1+1x_2+5x_3=-1

The coefficients of the variables are 0, 1, 5. These are the entries in row 2 of matrix A.

__

C. As stated in part A, the size of matrix A will match the number of equations and variables in the system. If the number of variables remains the same, the number of rows of A (and b) will reflect the number of equations. (The number of columns of A (and rows of x) will reflect the number of variables.)

6 0
3 years ago
4.9×108 in standard form?
ICE Princess25 [194]

Answer:

6.372

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
If f(x) = –5x – 4 and g(x) = –3x – 2, find (f – g)(x).
erica [24]

Answer:

  C.  (f – g)(x) = –2x – 2

Step-by-step explanation:

(f – g)(x) = f(x) – g(x)

  = (–5x – 4) – (–3x – 2)

  = –2x – 2

3 0
3 years ago
Let d = 3.
Phoenix [80]
The correct answer would be A.36.

Hope this helps;)
6 0
3 years ago
Read 2 more answers
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