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charle [14.2K]
3 years ago
5

Mark is draining his pool to clean it. At 12:00 P.M., he started to drain the pool. At 4:00 P.M., the pool had 11,600 gallons of

water. At 7:00 P.M., the pool had 6,800 gallons of water. If draining the pool is modeled by a linear function, how many gallons of water were initially in the pool?
Mathematics
2 answers:
likoan [24]3 years ago
4 0
I don't know because I didn't have my journal but I used my tablet white board and the answer is 16,400.
Bogdan [553]3 years ago
4 0

Answer:1800

Step-by-step explanation:

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Solve the system by substitution:<br> y = -3x + 10<br> y=-3x + 4<br> Please show the steps!
sergiy2304 [10]

Answer:

x=1, y=7

Step-by-step explanation:

y = -3x + 10 - first equation

y=-3x + 4 - second equation

rearrange the expression to

-3x-y= -10

3x-y= -4

pick an equation and simplify; lets pick the second equation

3x-y= -4

\frac{3x}{3} = \frac{-4+y}{3}  

divide 3 by both sides

x= \frac{-4+y}{3} - third equation

substitute the value of x into an equation; lets pick the first equation

-3x-y= -10

-3(\frac{-4+y}{3})- y = -10

simplify. -3 cancels 3 so we are left with

-1(-4+y)-y = -10

simplify

4-y-y= -10

4-2y= -10

subtract 4 from both sides

-2y= -10-4

-2y= -14

divide -2 by both sides

y=7

substitute the value of y, (y=7) in an equation, we are using the second equation

3x-y= -4

3x-7= -4

3x = -4+7

3x= 3

divide 3 by both sides

x=1

so the answer is x=1, y=7

5 0
4 years ago
A home improvement store normally sells 20-foot extension ladders for $225. This week the ladders are discounted by 20%. What is
Fantom [35]

Answer:

The answer is 180

Step-by-step explanation:

So to start off you have to turn 20% into a decimal and that is .20.

Next  you need to mutiply 225 and .20 and you will get 45 (that means it is $45 off)

Subtract 45 fro 225 and that is your answer.

You now pay $180 for the 20 foot extension ladder.

5 0
3 years ago
Solve for x. Please look at the picture and answer it. Thank you.
Tatiana [17]
<h3>Answer :- </h3>

  • x = 24

<h3>Solution :- </h3>

  • 2x + 42 = 90
  • 2x = 90 - 42
  • 2x = 48
  • x = 48/2
  • x = 24

<em>Hope</em><em> it</em><em> helps</em><em> </em><em>~</em>

7 0
2 years ago
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Setler [38]

Answer:

D. 19.5 Ft.

Step-by-step explanation:

Formula: B · H = A

Substitution: 3.25 · 2 = 6.5

6.5 · 3 ( 3 Windows ) = 19.5 Ft.

8 0
3 years ago
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oee [108]

Answer:

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Step-by-step explanation:

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r = 18/2 = 9

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3 years ago
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