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atroni [7]
3 years ago
10

Please help, i can't figure this out and im ready to pull my hair out!!!

Mathematics
1 answer:
Nat2105 [25]3 years ago
5 0

Answer:

I'm sorry I don't know the equation, but she walks 3 mph.

Step-by-step explanation:

We know that the answer is asking for speed, which needs both distance and time, so we also need both. Which is where the 9 mph is used. 9 mph means its a difference. b means biking mph, w means walking mph, sooo ----->>> b=w+9, and the difference in the 1st equation is 36, which means the first equation is 4 times larger than the b=w+9, so she walked 48 miles, as well as walked 12 miles in 4 hours. Divide then distances by 4, and you get 12 miles and 3 miles in one hour. Or 12 mph & 3 mph, which fits into 12=3+9. So she walks 3 miles per hour.

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Original: $75 new: $60
nadezda [96]

What's the question?

If it's "What's the difference?" or something like that, then the answer is 15. :)

4 0
3 years ago
Read 2 more answers
A new air scrubber project is being built in a field. 80% of the entire field will be developed. Leaving only 350 acres undevelo
Ray Of Light [21]

Answer:

  • field size: 1750 acres
  • developed area: 1400 acres

Step-by-step explanation:

If the developed area is 80% of the field, and the undeveloped area is 20%, then the developed area is 4 times the undeveloped area, so is ...

  developed area = 4 × 350 acres

  developed area = 1400 acres

Then the total area is ...

  total area = developed area + undeveloped area = (1400 +350) acres

  total area = 1750 acres

6 0
3 years ago
If g(n) = 3n - 2, then what is the value of g(10)?
solniwko [45]

Answer:The answer would be 28 the value of g would

be 2.8

Step-by-step explanation:

5 0
3 years ago
Solve the system by the substitution method. Show your work. 2y - x = 5, x2 + y2 - 25 = 0
Anna71 [15]
Subsitution

2y-x=5
minus 2y both sides
-x=5-2y
times -2 both sides
x=2y-5

subsitute 2y-5 for x in other equation

(2y-5)²+y²-25=0
expand
4y²-20y+25+y²-25=0
5y²-20y=0
factor
5y(y-4)=0
set to zero

5y=0
y=0

y-4=0
y=4


subsitute back

for y=0
x=2y-5
x=2(0)-5
x=-5
one solution is (-5,0)

for x=4
x=2y-5
x=2(4)-5
x=8-5
x=3
one solution is (3,4)




the 2 soltuions are (-5,0) and (3,4)
8 0
3 years ago
Line 1: 2x-3y>12
nata0808 [166]

Answer:

  • The graph of this line i.e. 2x-3y>12 should be BELOW the DOTTED line as y involves < symbol.
  • The graph of this line i.e. y>-2x+5  should be ABOVE the DOTTED line as it involves > symbol.
  • The correct graph for line 1  and line 2 is shown in attached figure.

Step-by-step explanation:

  • If the inequality involves < or >, then the graph of the equation involves a dotted line.  
  • If the inequality involves ≤ or ≥, then the graph of the equation involves a solid line.

<em>Considering the line 1</em>

2x-3y>12

Solving line 1

2x-3y>12

-3y>12-2x

3y

y

As y involves < symbol, so the graph of this line should be BELOW the DOTTED line.

But, as you can see that there is an error in the graph. As the graph of  y is being shown ABOVE the SOLID line.

Therefore, the graph of this line i.e. y should be BELOW the DOTTED line as it involves < symbol.

<em>Considering the line 2</em>

y>-2x+5

As y>-2x+5 involves > symbol, so the graph of this line should be ABOVE the DOTTED line.

But, as you can see that there is an error in the graph. As the graph of  y>-2x+5 is being shown ABOVE the SOLID line.

Therefore, the graph of this line i.e. y>-2x+5 should be ABOVE the DOTTED line as it involves > symbol.

The <em>correct graph</em> for line 1 i.e. 2x-3y>12 and line 2 i.e. y>-2x+5 is shown in <em>attached figure</em>.

From the attached graph, it is shown that only (5, -2) satisfies the both inequalities. So, (5, -2) is the correct solution for the given inequalities.

<em>Solution Verification:</em>

<u><em>Putting (5, -2) in line 1 and line 2</em></u>

For line 1:

2x - 3y > 12 ⇒ 2(5) - 3(-2) > 12 ⇒ 10 + 6 > 12 ⇒ 16 > 12 which is true.

For line 2:

y > -2x + 5 ⇒ -2 > -2(5) + 5 ⇒ -2 > -10 + 5 ⇒ -2 > -5 which is true.

So, (5, -2) is IN the solution for line 1 and line 2

<em><u>Putting (-1, -1) in line 1 and line 2</u></em>

For line 1:

2x - 3y > 12 ⇒ 2(-1) - 3(-1) > 12 ⇒ -2 + 3 > 12 ⇒ 1 > 12 which is false.

For line 2:

y > -2x + 5 ⇒ -1 > -2(-1) + 5 ⇒ -1 > 2 + 5 ⇒ -1 > 7 which is false.

So, (-1, -1) is NOT in the solution for line 1 and line 2

<em><u>Putting (0, 5) in line 1 and line 2</u></em>

For line 1:

2x - 3y > 12 ⇒ 2(0) - 3(5) > 12 ⇒ 0 - 15 > 12 ⇒ -15 > 12 which is false.

For line 2:

y > -2x + 5 ⇒ 5 > -2(0) + 5 ⇒ 5 > 0 + 5 ⇒ 5 > 5 which is false.

So, (0, 5) is NOT in the solution for line 1 and line 2

<em />

<em>Keywords: inequality, solution, graph, dotted line, solid line</em>

<em>Learn more about inequality solution from brainly.com/question/12036085</em>

<em>#learnwithBrainly</em>

4 0
3 years ago
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