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3 years ago

7x-7=2x-1 what is x please help

Mathematics

2 answers:

Anika [276]3 years ago

6 0

Answer:

7x+=2x-1

7x+2x=7+1

9x=8

x=9-8

x=1

Paraphin [41]3 years ago

4 0

Answer:

x= 1.2

Step-by-step explanation:

Step 1: Subtract 2x from both sides.

Step 2: Add 7 to both sides.

Step 3: Divide both sides by 5.

Hope this helped :)

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What does same day again mean

solmaris [256]

An repetition loop.

8 0

3 years ago

A fence must be built to enclose a rectangular area of ft. Fencing material costs per foot for the two sides facing north and so

avanturin [10]

The complete question is

A fence must be built to enclose a rectangular area of 5000ft^2. Fencing material costs $1 per foot for the two sides facing north and south and 2$ per foot for the other two sides. Find the cost of the least expensive fence.

Answer:

Total cost will be $400

Step-by-step explanation:

Let x = be other side

y = north and south side

Area = x*y = 5000

Perimeter of the rectangle = 2x + 2y

cost of fencing = 2(1)*5000/x + 2*2x

= 10000/x + 4x

now to get the least we will take the derivative of this

C'(x) = 10000(-1/x^2) + 4 =0

x^2 = 2500

x= 50ft cost = 2*$2*50 = $200

y= 100ft cost = 2*$1*100 = $200

Total cost = $400

3 0

3 years ago

The base of a solid right pyramid is a regular hexagon with a radius of 2x units and an apothem of units. A solid right pyramid

Xelga [282]

Answer:

$6 x^2*\sqrt{3}$

Step-by-step explanation:

The base of the pyramid we need to study is a hexagon.

Let's look at the attached image of an hexagon to understand how we are going to find the area of this figure.

Notice that an hexagon is the combination of 6 exactly equal equilateral triangles in our case of size "2x" (notice that the "radius" of the hexagon is given as "2x")

Therefore the area of the hexagon is going to be 6 times the area of one of those equilateral triangles.

We know the area of a triangle is the product of its base times its height, divided by 2: $\frac{base*height}{2} = \frac{2x*height}{2}$

We notice that the triangle's height is exactly what is called the "apothem" of the hexagon (depicted in green in our figure) which measures $x\sqrt{3}$ , so replacing this value in the formula above for the area of one of the triangles: