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2 years ago

Im giving extra points and brainliest

Mathematics

2 answers:

mrs_skeptik [129]2 years ago

8 0

The answer would be c I think

Veseljchak [2.6K]2 years ago

5 0

Answer: the c

Step-by-step explanation:

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) The density of oil in a circular oil slick on the surface of the ocean at a distance of r meters from the center of the slick

Feliz [49]

Answer:

Therefore the mass of the of the oil is 409.59 kg.

Step-by-step explanation:

Let us consider a circular disk. The inner radius of the disk be r and the outer diameter of the disk be (r+Δr).

The area of the disk

=The area of the outer circle - The area of the inner circle

= $\pi (r+\triangle r)^2- \pi r^2$

$=\pi [r^2+2r\triangle r+(\triangle r)^2-r^2]$

$=\pi [2r\triangle r+(\triangle r)^2]$

Since (Δr)² is very small, So it is ignorable.

∴ $A=2\pi r\triangle r$

The density $\delta (r)= \frac{40}{1+r^2}$

We know,

Mass= Area× density

$=(2r \pi \triangle r)(\frac{40}{1+r^2}})$

Total mass $M=\sum_{i=1}^n \frac{80r_i\pi }{1+r^2}\triangle r_i$

Therefore

$\sum_{i=1}^n \frac{80r_i\pi }{1+r^2}\triangle r_i=\int_0^5 \frac{80r\pi }{1+r^2}dr$

$=40\pi[ln(1+r^2)]_0^5$

$=40\pi [ln(1+5^2)-ln(1+0^2)]$

$=40\pi ln(26)$

= 409.59 kg (approx)

Therefore the mass of the of the oil is 409.59 kg.

3 0

2 years ago

AB is parallel to ED.

ivolga24 [154]

Answer:

BE = 22.4 cm

Step-by-step explanation:

Δ CAB and Δ CDE are similar , then ratios of corresponding sides are equal, that is

$\frac{CB}{CE}$ = $\frac{AB}{DE}$ , substitute values

$\frac{6.4}{CE}$ = $\frac{8}{20}$ ( cross- multiply )

8 CE = 128 ( divide both sides by 8 )

CE = 16 cm

Then

BE = BC + CE = 6.4 + 16 = 22.4 cm

4 0

3 years ago

Mary leaves her house to take a walk. The graph shows the distance, d, in feet from

andrew-mc [135]

D. 35, since that would be the longest amount. of time walking away from her house, she should be the farthest amount of feet away from her house

7 0

3 years ago

Pleaze hel0 me i dont know how to do this im giving a brainliest to the first person to answer

Sliva [168]

Answer:

416m $m^{3}$

Step-by-step explanation:

Volume is found by Length x Width x Height

10.4 x 5 x 8

416

7 0

3 years ago

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What is R,S,W? I really need help!

Eva8 [605]

Answer:

R = 73

S = 73

W = 138

Step-by-step explanation:

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3 years ago

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