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Vlad1618 [11]
2 years ago
5

Decide whether n = 9 is a solution to the equation 2+n=7. Write yes or no

Mathematics
1 answer:
mel-nik [20]2 years ago
3 0

Answer:

No. The answer would be n=5

Step-by-step explanation:

You have to subtract the 2 from both sides to cancel it out on the left side. so you would be doing 7-2, not 7+2

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Which two lines are parallel?
Masteriza [31]

Answer:

  • 3x + y = -2
  • 2y = -6x – 8

Step-by-step explanation:

When the equations are written in the same form, the ratio of x coefficient to y coefficient is the same for parallel lines.

These equations in the same form are ...

  • 3x +y = -2
  • -6x +2y = 4
  • 6x +2y = -8

The first and last of these equations have a ratio of x-coefficient to y-coefficient of ...

  (x-coefficient)/(y-coefficient) = 3/1 = 6/2

so the lines are parallel.

The second equation has a ratio that is the opposite of this.

__

<em>Alternate approach</em>

You can put each equation into slope-intercept form (solve for y). The x-coefficient is then the slope of the line. Parallel lines** have equal slopes.

  • y = -3x -2 **
  • y = 3x +2
  • y = -3x -4 **

_____

I find a graphing calculator to be a big help for many problems involving equations and their characteristics.

6 0
3 years ago
Lexus skateboards from his house to school 4 miles away. It takes him 20 minutes.
RoseWind [281]

Answer:

\displaystyle m = \frac{1}{5}\cdot t

Step-by-step explanation:

<u>Proportional Model</u>

The number of miles m that Lexus can skateboard in t minutes can be modeled by:

m = kt

It's given that Lexus skateboard from his house to school for a distance of m=4 miles in t=20 minutes.

Substituting:

4 = k.20

Dividing by 20

k=\frac{4}{20}

Simplifying:

k=\frac{1}{5}

This produces the model

\displaystyle m = \frac{1}{5}\cdot t

6 0
3 years ago
Read 2 more answers
Can u help me
fiasKO [112]

The diagram shows that FG = IJ are congruent segments due to the double tickmarks. These are the hypotenuses of the right triangles.

So that takes care of the "H" in "HL".

The L stands for "leg", so we need to have a congruent pair of corresponding legs.

Due to the orientation of the triangles, it's not clear how the corresponding legs match up, but if any of the following is true

  • EF = IK
  • EF = JK
  • EG = IK
  • EG = JK

then we'd have enough to use HL.

4 0
3 years ago
Find the area and the circumference of a circle with diameter 8 cm. Use the value 3.14 for π , and do not round your answers. Be
Illusion [34]

Answer:

Area= 50.24 squared cm.

Circumference= 25.12 cm.

Step-by-step explanation:

To find the area of a circle- A= 3.14*(4 cm squared). ( The 4 cm is your radius. Half of the diameter.) After you square your radius you get 16cm squared. You then go onto multiply the 16 cm squared by 3.14 to get 50.24 cm squared.

To find the circumference of a circle- C= 2*(3.14)*(4cm). (Again the 4cm is your radius. Half of the diameter.) After you multiply the 2 and 3.14 you get 6.28. You then multiply the 6.28 by 4 cm to get 25.12 cm.

7 0
3 years ago
Fill in the sign that completes the equation below<br><br> 7,300=730 10
Zepler [3.9K]
It is a multiplication sign. *
I hope I helped.

7 0
3 years ago
Read 2 more answers
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