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3 years ago

Use cross products to determine whether the pair of ratios 4/6 and 14/21 form a proportion. Write yes or no. SHOW WORK

1 answer:

3 0

4/6 can reduce to 2/3. (divide each by 2)
14/21 can reduce to 2/3 by dividing the nume/denominator by 7.
in this case, they are proportional.

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Can someone please show me when to graph this?

Mnenie [13.5K]

Answer:

almost -.4

Step-by-step explanation:

The way I would answer these when I was in school, just divide -3/7.

that gives you -.428 so it is pretty close to .-4, but not exactly on it.

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3 years ago

Mya buys six goldfish and four angelfish what fraction of the fish are goldfish mya buys two more goldfish what fraction of the

Ulleksa [173]

In the first part, there are 10 fish total. 6/10 = 3/5 which means that there were 3/5 goldfish. When she buys two more, the total becomes 12 and 4/12 = 1/3 Hope this helps!

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3 years ago

Please answer this! Thanks!

Leto [7]

[ [13.9] ] - [ [-8.23] ] +[ [7.04+6.7] ]=35.87

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3 years ago

The volume of a spherical balloon is increasing at the constant rate of 8 cubic feet per minute. How fast is the radius incresin

OverLord2011 [107]

Answer:

Rate of increase of radius = 0.0064 ft/sec

Rate of increase of surface area = 1.61 $ft^2/sec$

Step-by-step explanation:

Given that:

Rate of change of volume of a spherical balloon = 8 cubic feet per minute

$\dfrac{dV}{dt} = 8 ft^3/min$

Radius, $r$ = 10 feet

To find:

The rate of change of radius at this moment and rate of change of surface area at this moment?

Solution:

First of all, let us have a look at the formula:

$1.\ V = \dfrac{4}{3}\pi r^3\\2.\ A =4\pi r^2$

Now, differentiating the volume and area, we get:

$\dfrac{dV}{dt} = \dfrac{4}{3}\times 3 \pi r^2 \dfrac{dr}{dt}\\\Rightarrow \dfrac{dV}{dt} = 4 \pi r^2 \dfrac{dr}{dt}$

$\dfrac{dA}{dt} = 4\pi \times 2 r \dfrac{dr}{dt}\\\Rightarrow \dfrac{dA}{dt} = 8\pi r \dfrac{dr}{dt}$

$\dfrac{dV}{dt} = 8 = 4\pi r^2 \dfrac{dr}{dt}\\\Rightarrow 8 = 4\times 3.14 \times 10^2 \dfrac{dr}{dt}\\\Rightarrow 2 = 3.14 \times 10^2 \dfrac{dr}{dt}\\\Rightarrow \dfrac{dr}{dt} = 0.0064\ ft/sec$

$\dfrac{dA}{dt} = 8\times \pi \times r \dfrac{dr}{dt}\\\Rightarrow \dfrac{dA}{dt} = 8\times 3.14 \times 10 \times 0.0064\\\Rightarrow \dfrac{dA}{dt} = \bold{1.61 \ ft^2/sec}$

7 0

2 years ago

8.F. 2

alexdok [17]

Answer:

I don't know. Make your question clearer, please.

Step-by-step explanation:

4 0

2 years ago

Use cross products to determine whether the pair of ratios 4/6 and 14/21 form a proportion. Write yes or no. *SHOW WORK*

Use cross products to determine whether the pair of ratios 4/6 and 14/21 form a proportion. Write yes or no. SHOW WORK