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solmaris [256]
3 years ago
10

Solve for 5x - 7 + 2x = 21 Help this will be very much appreciated .

Mathematics
2 answers:
dexar [7]3 years ago
6 0

Answer:

x = 4

Step-by-step explanation:

Pull out like factors:  7x - 28  =   7 • (x - 4)

Solve:  x-4 = 0

Add  4  to both sides of the equation: x = 4

Please mark as brainliest.

Thanks!

Alex_Xolod [135]3 years ago
4 0
I think it’s 4 but I’m not sure
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If the farmer has 250 feet of fencing to create a rectangular pen, define a function f that expresses the area of the field (mea
hoa [83]

Answer:

Maximum area possible

f(max)  = 3906,25 ft²

Dimensions:

a  = 62,5  ft

w  = 62,5 ft

Step-by-step explanation:

Perimeter of the rectangular fencing    P  =  250 feet

And sides of the rectangle  a  and  w (width of rectangle)

Then

A =  a*w

2a  + 2w  = 250       ⇒  a  =  (250 -2w)/ 2    ⇒  a = 125 - w

f(w)  =  (125  - w ) *w        f(w)  = 125w - w²  

Taking derivatives both sides of the equation

f´(w)   =  125  - 2w              f´(w)   = 0           125  - 2w = 0

w = 125/2

w = 62,5 ft            ⇒  a = 125 - 62,5

a = 62,5 ft

f(max)  = ( 62,5)²

f(max)  = 3906,25 ft²

8 0
3 years ago
Someone please help ?????
Amiraneli [1.4K]
U=40
I think am sure
8 0
3 years ago
Use induction to prove that 2 divides n^2 n whenever n is a positive integer
andrey2020 [161]

Answer:

that's wrong

Step-by-step explanation:

for n = 1

n^(2n)=1²=1

and 2 doesnt devide 1

5 0
3 years ago
The new patio at Tonya's house is 5 yards long by 10 feet wide. She is going to cover the patio with square bricks that measure
Klio2033 [76]

Answer:

A

Step-by-step explanation:

Steps to take to determine the answer

  1. Because the length is in yards, it has to be converted to foot
  2. Find the area of the patio using the length and width measured in foot
  3. Determine the area of the square brick
  4. Multiply the cost of the brick by the area

1 yards = 3 foot

5 x 3 = 15 foot

Area of a rectangle = length x breadth

15 x 10 = 150 ft^2

Cost = 150 x 4 = $600

4 0
3 years ago
Enter the decimal equivalent of 6/8​
ikadub [295]

Answer:

.75

Step-by-step explanation:

6/8 can be simplified to 3/4, if that helps.

3 0
3 years ago
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