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notka56 [123]
3 years ago
7

I need to find out this questions but I don't know how to do it

Mathematics
1 answer:
Fiesta28 [93]3 years ago
7 0
Number 8? I don't know which one you are talking about.
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The mass of the part of a metal rod that lies between its left end and a point x meters to the right is 4x2 kg. (See this exampl
Ganezh [65]

Answer:

A) 32 kg/m

B) 48 kg/m

C) 72 kg/m

Step-by-step explanation:

We are given mass is; m = 4x²

Linear density is the derivative of mass with respect to the position x. So linear density is;

ρ = dm/dx

Differentiating 4x²,we have; ρ = 8x

A)at x = 4; ρ = 8(4) = 32 kg/m

B) at x = 6; ρ = 8(6) = 48 kg/m

C) at x = 9; ρ = 8(9) = 72 kg/m

5 0
2 years ago
find the length of a rectangular lot with a perimeter of 140 m if the length is 6 m more than the width.
satela [25.4K]
The width would be x.
the length would be x+6
there are two of each (since it’s a rectangle)
so x+x+x+6+x+6=140
simplify
x= 32
l= 38
w= 32
7 0
3 years ago
ILL BRAINLIEST YOU PLEASE HELP ME
VARVARA [1.3K]

Answer:

I am so sorry, I have never done that type of math before.

Step-by-step explanation:

3 0
3 years ago
A swim coach has at most $800 to buy equipment for the swim team. Each pull buoy costs $5.50 and each kickboard costs $10. Let x
MissTica

Answer:

5.50x+10y≤800

Step-by-step explanation:

The pull bouys are $5.50 each (5.50x)

The kickboards are $10 each (10y)

And the words "at most" mean less than or equal to

Hope this helps

(can I plz have a brainliest)

3 0
3 years ago
This is a question about percent change help if you can pls!
Serhud [2]

Answer:

Step-by-step explanation:

\Delta \% =100\left(\frac{final value-initial value}{initial value}\right)\\ \\ \Delta \% =100\left(\frac{2758526-2838233}{2838233}\approx -2.8\%

4 0
2 years ago
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