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Dmitriy789 [7]
3 years ago
12

Marianne is completing a 4-mile route for

Mathematics
1 answer:
Bogdan [553]3 years ago
3 0

Answer:

For 1 miles distance: 7/10 of a mile she runs and 3/10 she walks.

For 4 miles distance (4 times the previous distance) she will run:

4*(7/10) = 18/20 = 2.8 miles

and walk:

4*(3/10) = 12/10 = 1.2 miles.

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a rectangular block is such that the sides of its base are of the length x cm and 3x cm. The sum of all the lengths of all its e
Xelga [282]

Answer:

15x^2 - 12x^3

Step-by-step explanation:

A rectangular block has 3 parts that play into its volume.  length, width and height.  The question gives us length and width in the form of x and 3x, so height is what's missing.

It gives us a bit more information saying the sum of its edges is 20.  We also have to ask how many lengths, widths and heights are there.  That may be a bit hard to understand, but  is you are looking at a block I could ask how many edges are vertical, just going up and down.  These would be the heights.  There are 4 total, and this goes the same for length and width, so 4*length + 4*width and 4*height = 20.  

Taking that and plugging in x for length and 3x for width (or you could do it the other way around, it doesn't matter, you get:

4*x + 4*3x + 4*height = 20

4x + 12x + 4h = 20

16x + 4h = 20

4h = 20 - 16x

h = 5 - 4x

Now we have h in terms of x, which lets us easily find the volume just knowing x.  To find the volume of a rectangular block you just multiply the length, width and height.

x*3x*(5-4x)

3x^2(5-4x)

15x^2 - 12x^3

Question doesn't give a specific value for x at all so you should be done there.  Any number you plug in for x should get you the right answer

5 0
3 years ago
Write the expression as the sine, cosine, or tangent of an angle.
Georgia [21]

Answer:

sin 8x

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Please help me with the problems in my picture
Tamiku [17]

Answer:

1.) C

2.) miles

3.) Car A is faster

3 0
3 years ago
CAN SOMEONE HELP MEEEEE
Lorico [155]

Answer:

Ok 1 is 54 yards 2 is 225 KM 3 64 Ft

please give braineist I never got 1 thank you maybe we can be friends !!! :) :D

6 0
3 years ago
Read 2 more answers
Help is GREATLY appreciated.
Lynna [10]
I think its 28.5, but you should check with someone else.
4 0
3 years ago
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