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3 years ago

8 x 6 = 4 x __ x 2 What is going to be put in the blank?

Mathematics

2 answers:

Pavel [41]3 years ago

7 0

8 x 6 = 4 x 6 x 2 since 4 x 2 is 8 and then 8 x 6

sergejj [24]3 years ago

3 0

8*6= 4*6*2 it would be 6 because if you multiply 6*4=24*2=48 it's the same as 8*6

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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

3 years ago

Solve the proportion<br>16/6 = 3s/9

iris [78.8K]

Answer:

Step-by-step explanation:

So you can start by simplifying each fraction:

16/6 divide by 2/2 = 8/3

3s/9 divided by 3/3 = s/3

Then, since 8/3 = s/3 you just have s = 8.

4 0

3 years ago

The slope of the line below is 3. Use the coordinates of the labeled point (6, 8) to find a point-slope equation of the line.

Marina CMI [18]

<span>point-slope equation

y - 8 = 3(x - 6)

hope it helps</span>

5 0

3 years ago

Read 2 more answers

Isolate c in the equation a=b(1/c-1/d)

Irina-Kira [14]

A=b/c -b/d
a+b/d=b/c
(da+b)/d=b/c
db=(da+b)c
c=db/da+b

5 0

3 years ago

Determine if true:<br> 1y+8y+10y=20y

diamong [38]

Answer:

False

Step-by-step explanation:

1+8=9

9+10=19

1y+8y=9y

9y+10y=19y

19y=20y

The equations dont match.

Hence, the equation is false.

6 0

2 years ago

Read 2 more answers