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masha68 [24]
3 years ago
11

The sum of a number and 7 is the same as double the number increased by 3

Mathematics
2 answers:
dimulka [17.4K]3 years ago
8 0
The statement above is the same as the mathematical expression below...

x + 7 = 2x + 3

We want to solve for x in these types of problems. To do so, we must get all of the "x"s on one side of the equal sign and the constants on the other.

7 - 3 = 2x - x
4 = x

Our answer is x = 4.
koban [17]3 years ago
4 0
So, let’s represent the number as n:
n+7=2n+3
Subtract both sides by 3:
n+4=2n
Now by n:
2n=4
Divide:
n=2
The number is 2
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BRAINLIEST!!! Plz help ASAP
Svetllana [295]

Answer: R = (4, 5)

Step-by-step explanation: Midpoint is simply the center of a line. So, the equation for it is ((x1+x2)/2, (y1+y2)/2). Hence for this,

x coordinate- (6+x)/2=5

                        x=4

y coordinates- (9+y)/2=7

                         y=5

And therefore R is (4, 5)

6 0
3 years ago
The sides of a rectangle are in the ratio of 4:5. If the width is 28 in., find the length, the perimeter, and the area of this r
nadezda [96]
If the width is 28 inches, then divide that by 4 and you get 7. You multiply that by 5 to get the length. That would be 35. Just to check, you know that the width 28 and length 35 are in ratio 4:5 if you divide by 7. The perimeter would be 2(35+28)=63*2=126. So the perimeter is 126. The area would be 35*28 which is 980. To sum up, the answers are as follows.

Length: 35 in
Perimeter: 126 in
Area: 980 inches squared.
5 0
3 years ago
Quadrilateral ABCD is a rectangle.
jeka94

Answer:

A

Step-by-step explanation:

The diagonals of a rectangle are congruent and bisect each other, so

AC = BD

2AG = 2DG, that is

AG = DG, substitute values

- 7y + 5 = 2y + 68 ( subtract 2y from both sides )

- 9y + 5 = 68 ( subtract 5 from both sides )

-9y = 63 ( divide both sides by - 9 )

y = - 7

Hence

BD = 2(2y + 68)

     = 4y + 136

     = (4 × - 7) + 136

     = - 28 + 136

     = 108 → A

5 0
3 years ago
Please help on 1-8 I will give thanks or brainliest
eimsori [14]
[1] 115km [x] 10 = 1150hm   [.] 115km [x] 100 = 11500dam  [.] 115km [x] 1000 = 115000m

[2] 418cL [÷] 10 = 41.8dL   [.] 418cL [÷] 100 = 4.18L   [.] 418cL [<span>÷] 1000 = 0.418daL
</span>
[3]  40cm = 400mm

[4] 500mL = 5dL

[5] 6kg = 6000g

[6] 5000cL = 50L

[7] 4kg = 40hg

[8] 200mm = 20cm

Hope this helped! :)


4 0
3 years ago
Starting at an initial position of 100 meters, a person jogs at 5 meters per second for 1 minute forward and then walks backward
il63 [147K]

Answer:

100 + (5 * 60) = 400

400 - (2*120) = 160

end position = 160

Step-by-step explanation:

6 0
3 years ago
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