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STALIN [3.7K]
3 years ago
6

The width of a rectangle is represented by 5 + 2y. The length is twice as long as the width. What is the perimeter of the rectan

gle.
Mathematics
1 answer:
Alex777 [14]3 years ago
4 0

Answer:

62y

Step-by-step explanation:

Because we have 5 and 2y you put them together with division and stuff and get 62y

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area of a triangle is 240 centimetre square and its base is 20 CM then find its height of the triangle​
Damm [24]
Area would have to be a number
4 0
3 years ago
Please help fast<br> The graph shows the function f(x)
DedPeter [7]

Answer:

3/1

Step-by-step explanation:

The average rate of change is the distance between y values divided by the distance between x values. We know this as rise/run or slope for linear equations. For non-linear equations, we calculate the average over an interval.

This function has y-values of -1 at x=0 and 5 at x=2.

We add -1+5=6 and divide this by 2-0=2.

6/2=3.

The y-values on average change 3 units for every 1 unit of the x-values.

4 0
3 years ago
6x+3=4x+9 can you guys explain this for me
Paraphin [41]
We have such equation
6x+3=4x+9             /-4x      subtract 4x both sides
6x-4x+3=4x-4x+9
2x+3=9            /-3     subtract 3 both sides   
2x=6               /:2      divide both sides by 2
x=3 - its result
7 0
3 years ago
Read 2 more answers
Use completing the square to solve this quadratic equation.
borishaifa [10]

Step-by-step explanation:

x² + 6x + 9 = 2

(x + 3)² = 2

x + 3 = ±sqrt(2)

x = -3 ± sqrt(2)

so, B and D are correct.

control :

(-3 + sqrt(2))² + 6(-3 + sqrt(2)) + 9 = 2

9 + 2 - 6sqrt(2) - 18 + 6sqrt(2) + 9 = 2

2 = 2

correct

(-3 - sqrt(2))² + 6(-3 - sqrt(2)) + 9 = 2

9 + 2 + 6sqrt(2) - 18 - 6sqrt(2) + 9 = 2

2 = 2

correct

(3 + sqrt(2))² + 6(3 + sqrt(2)) + 9 = 2

9 + 2 + 6sqrt(2) + 18 + 6sqrt(2) + 9 = 2

38 + 12sqrt(2) = 2

wrong.

(3 - sqrt(2))² + 6(3 - sqrt(2)) + 9 = 2

9 + 2 - 6sqrt(2) + 18 - 6sqrt(2) + 9 = 2

38 - 12sqrt(2) = 2

wrong.

7 0
3 years ago
Y= x +2 and y=3x-4 solved using substitution
weqwewe [10]
So I did this:

y=x +2
y=3x-4

I used the first equation to plug into the second equation.
x+2= 3x -4
I subtracted 3 from both sides so I get
-2x+2=-4
So I subtract 2 from both sides so I get
-2x=-6
I divide -2 on both sides and so I get
x=3
Then I plug the x into either equation. I did the first equation.
y=3+2
y=5
So x=3 and y=5
6 0
3 years ago
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