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AlexFokin [52]
3 years ago
6

David is rowing a boat upstream. The river is flowing at a speed of 2 miles per hour. David starts rowing at a speed of 6 miles

per hour, but as he gets tired his speed decreases (at a rate of 1 mile per hour, every hour). Which equation represents the speed of the boat for x hours spent rowing?
y = 6 − 2x
y = x − 4
y = 4 − x
y = 6 − x
y = x + 4
Mathematics
2 answers:
Virty [35]3 years ago
4 0
Y=x - 4 Is Correct. hope This helps 


zavuch27 [327]3 years ago
3 0

Answer:

y = 4 - x

Step-by-step explanation:

Given,

The speed of David's boat = 6 miles per hour,

Speed of stream = 2 miles per hour,

So, the speed of boat in upstream = Speed of boat - Speed of stream

= 6 - 2

= 4 miles per hour,

Now, this speed is decreasing at the rate of 1 miles per hour,

So, the total decreased speed in x hours = x miles per hour,

Hence, the final speed of boat after x hours = ( 4 - x ) miles per hour,

If y represents the final speed ( miles per hour ) of boat after x hours ,

⇒ y = 4 - x

Which is the required equation.

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Taya2010 [7]

Answer:

1) Area of frame: 140cm^2 ; Area of picture: 40cm^2 ; Total Area: 180cm^2.      

2) Area 1 =  48cm^2 ; Area 2 = 12cm^2 ; total area = 60cm^2 [first answer line : 60cm^2]

Step-by-step explanation:

1. So to answer this question, you have to find the inner photo area first (which you will then subtract from the overall rectangle area to get the photo frame area).

To find area, you multiply length x width. For this question, there are not enough measurements given to initially multiply length and width. So, assuming that the photo is centered on the frame and the frame width is consistent along all sides, you find the difference between the overall length (12) and the picture length (5).

12 - 5 = 7

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(area is measured in squared units, so the area of the frame should be written as 140cm^{2} ; and the area of the photo should be written as 40cm^{2})

The total area is the entire area of the rectangle: (12)(15) = 180. (This should be written as 180cm^2)

--------------------------------------

2) Finding the area of a shape that isn't a simple rectangle is easier if you separate the shape into smaller rectangles. I will separate the two rectangles into 4 x 12 and 2 x 6 [6 cm would be the remaining side length if you remove the length of 4].

{you can separate the shape in multiple ways, so my answer is only one answer to this problem out of other splits.}

as mentioned, the area is length x width.

4 x 12 = 48.

2 x 6 = 12. Once again, you should write area in squared units.

(the area 1 should be written as 48cm^{2} ; the area 2 should be written as 12cm^2)

you can combine the separated areas (add them) to find the total area. 48 + 12 = 60.

(the total area should be written in squared units also, so the total area should be written as: 60cm^2)

The area of the figure is 60cm^2

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