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Sedaia [141]
3 years ago
14

Simplify fully: 4d² - 6d² + 5d² and 7x + 5y - 3x - 8y

Mathematics
1 answer:
Setler [38]3 years ago
3 0
1)
<span>4d² - 6d² + 5d² =  d²(4-6+5)  = 3d²

2)</span>
<span>7x + 5y - 3x - 8y = 4x  -3y</span>

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Please I have my final now can someone help me with this fast
Mariana [72]

Answer:

option B

Step-by-step explanation:

Given :

y = \frac{2}{3}x + 3\\\\y = \frac{5}{2}x + \frac{7}{2}\\\\

Step 1 : simplify the equation :

3y = 2x + 9\\\\2y = 5x + 7\\

Step 2: Arrange the terms :

2x - 3y = - 9\\\\5x -2 y = -7

Step 3 : Solve for x and y :

                                2x - 3y = - 9 ------ ( 1 )

                                5x - 2y = - 7 --------- ( 2 )

                              _____________________

              ( 1 ) x 5 => 10x - 15y = - 45    ---------- (3 )

              ( 2) x 2 => 10x - 4y = - 14    ----------- (4 )

                             _______________________              

           ( 3 ) - ( 4 ) =>  0x - 11y = - 31

                                    - 11 y = - 31

                                        y = \frac{31}{11}

              Substitute y in ( 1 ) :

                     2x - 3y = - 9

                     2x - 3 (\frac{31}{11}) = - 9\\\\2x = -9 + 3(\frac{31}{11})\\\\2x = - 9 + \frac{93}{11}\\\\2x = \frac{-99 + 93}{11} \\\\2x = \frac{-6}{11} \\\\x = \frac{-6}{2 \times 11} = -\frac{3}{11}

Therefore the solution to the sytem is ( - \frac{3}{11} , \frac{31}{11})

The solution of the system of equation is a point which lies

on the both the lines.

Option A : False ,  It says the solution lies above one of the given line.

               But the solution of the system of equation always lies on

                both the line.

                     

Option B : True , says the solution is a point on the coordinate plane.

Option C : False, because if the solution is on the x-axis , then

                  the y coordinate in the solution would be zero.

                   But it  is not zero.

Option D : False , the solution is the point where both the lines intersect.

8 0
3 years ago
In a school machine shop, 60% of all machine breakdowns occur on lathes and 15% occur on drill presses. Let E denote the event t
RSB [31]

Answer:

A. P(EC) = 0.4  

B. P(E∪E) = 0.75

C. P(EC ∩ FC) = 0.25

Step-by-step explanation:

Let us calculate -:

we are given with - P(E) = 60 and P(F) =.15,

Thus , (a) P(E^C)=1-P(E)

                   =1-0.6

                   =0.4

(b) P(E∪F) = P(E) + P(F)

   = 0.60 + 0.15

   = 0.75

(c) P(E^C∩F^C) =1-P(E∪ F)

   =1-0.75

   = 0.25

Hence , the answers are -A. P(EC) = 0.4  , B. P(E∪E) = 0.75  , C. P(EC ∩ FC) = 0.25.

6 0
3 years ago
I need help with Estimated Variable and Fixed Cost. How do I figure that out in the problem attached?
saul85 [17]

The fixed and variable costs of the given table of production costs are respectively; $161280 and $42

<h3>How to calculate fixed and variable costs?</h3>

Variable costs are costs that vary/change depending on the company’s volume of production while fixed costs are costs that do not change in relation to volume of production.

Fixed costs = Production Cost + Selling expenses + Administrative Expenses

Fixed Cost = $103200 + $21500 + $7300 + $1600 + $1800 + $21000 + $2600 + $2280 = $161280

Variable cost = $15 + $10 + $8 + $3 + $3 + $1 + $2

Variable cost = $42

Read more about fixed and variable costs at;brainly.com/question/15705476

#SPJ1

6 0
2 years ago
Alice separated her pictures into 3 piles. Each pile contained 9 pictures. How many pictures did she have in all? Write and solv
GarryVolchara [31]
27 total pictures.     9x3=27

4 0
3 years ago
Read 2 more answers
Please help me ASAP easy problem giving brainlist!!
Fiesta28 [93]
<> because it means greatest and least only
7 0
3 years ago
Read 2 more answers
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