1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
EastWind [94]
3 years ago
7

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

Mathematics
1 answer:
Dafna1 [17]3 years ago
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.
You might be interested in
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.

6 0
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!
3 0
3 years ago
Please answer this! Thanks!
Leto [7]

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

3 0
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
Other questions:
  • Find the volume. cylinder—r = 2 cm; h = 3 cm
    9·1 answer
  • 2. A farmer sells half of his yearling calf herd at the local stockyards. His average weight for each of the 30 head sold was 57
    14·1 answer
  • What is the greatest common factor of 12, 40 and 68
    13·1 answer
  • Help with maths questions please
    11·2 answers
  • 4. Marcella has 4 fewer male cousins than female cousins. Let f represent the number of female cousins. Write an expression for
    13·1 answer
  • PLEASE HELPPPPPPPPPP
    7·1 answer
  • Uma piscina possui 5 m de comprimento, 3 m de largura e 2,5 m de profundidade. Calcule: a) A quantidade de azulejo necessária pa
    5·1 answer
  • A math test has 40 questions. A student answers 85% of the questions correctly. How many questions did the student answer correc
    7·2 answers
  • Macy's department store just had a huge sale and now needs to increase the price of all retail by 13%. What will be the price of
    8·1 answer
  • What is the area of the base?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!