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Evgen [1.6K]
3 years ago
12

The variables x and y are directly proportional, and y=2 when x=3. what is the value of y when x=9?

Mathematics
2 answers:
laiz [17]3 years ago
8 0
X varies directly as y
x = ky
3 = 2k
k = \frac{3}{2}
 when x =9
9 = \frac{3}{2}y
\frac{18}{3} = y
∴y = 6

please mark as brainliest
olasank [31]3 years ago
8 0
If x and y are directly proportional, x = ky
When x = 3, y = 2.
So 3 = 2k
k = 3/2
So x = 3y/2
When x = 9,
9 = 3y/2
18 = 3y
y = 6
So when x = 9, y = 6.
Please mark my answer as brainliest. Thank You!

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Virty [35]

Answer:

here

h=x,p=15,b=9

using pythagoras theorem

h^2=p^2+b^2

x^2=15^2+9^2

x^2=225+81

x^2=306

x=3 √34 is the answer

6 0
3 years ago
What is f(-3) if f(x) = 12x + 11 + 5?
Zina [86]

Answer:

-20

Step-by-step explanation:

f (-3) = 12 x -3 + 11 +5

                          ^

          12 x -3  + 16

                ^

              -36 + 16

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6 0
3 years ago
A certain laundry detergent recommends \frac{1}{4}
Ray Of Light [21]

Answer:

2

Step-by-step explanation:

\frac{1}{4} a cup detergent for \frac{1}{2} a load of clothes would mean for each full load, it would take \frac{1}{2} a cup of detergent.

Thus if you have 4 load of clothes, which is 8 half loads. You can take that 8 half loads and multiply \frac{1}{4} by 8. This gives you 2 cups of detergent.

3 0
3 years ago
100 POINTS!!! Brainliest if correct, I report if the answer is absurd. Don’t answer if don’t know.
Lena [83]

Answer: D

Step-by-step explanation:

To find the perimeter of the square, you want to first find the length of each side. Since the figure is a square, we know that each side is equal to each other. We can set the expressions equal to each other to find x.

\frac{3}{4}x-1=\frac{1}{2}x+7           [subtract both sides by 1/2x]

\frac{1}{4}x-1=7                    [add both sides by 1]

\frac{1}{4}x=8                           [multiply both sides by 4]

x=32

Now that we know x, we can plug it into each expression to find teh length of each side.

\frac{3}{4}(32)-1                       [multiply]

24-1                           [subtract]

23

Now that we know each side is equal to 23, we can add all the sides together to find the perimeter.

23+23+23+23=92        or          23×4=92

Since we know that the perimeter is 92 units, the answer is D.

3 0
4 years ago
Read 2 more answers
. How long does it take hair to grow 8 inches?
Veronika [31]

First of all, I do not see the need for the very long pause before the question. It just makes people like me have a harder job answering. But ok, here we go.


On average, it will take 9–10 months for that growth to occur.

However, look at this answer to the question, and read it carefully before using the above as an answer.

The length of time it takes to go from shorter to longer hair depends on whether you're starting from a pixie cut or a bob, and whether you're aiming for ponytail length or Rapunzel locks. It also hinges on the condition of your hair, what kind of nutrition you're consuming, how often you're trimming and how much you're stressing out your tresses along the way. Start from the inside and work your way out to add inches to your hair length in the least amount of time.

Beauty begins on the inside, and long, lustrous locks are no exception. A diet balanced in fruits, vegetables, protein and calcium is a good start, but ask your doctor if adding a supplement is in order. Hair can benefit from iron, which helps oxygenate strands, and zinc, which also aids in growth. Biotin and other B-complex vitamins help plump up hair thickness while adding healthy shine. Vitamin D can help keep follicles on a regular growth schedule. Foods and vitamin supplements that feed the hair can also give skin and nails a boost for a complete healthy makeover.

For the second question:

If you would like to know how much a 93-pound person weighs on the Moon, you can calculate this using the following steps:


120 pounds on the Earth ... 20 pounds on the Moon

93 pounds on the Earth ... x pounds on the Moon = ?


120 * x = 20 * 93      /120

x = 20 * 93 / 120

x = 15.5 pounds on the Moon


The correct result would be 15.5 pounds on the Moon.

3 0
3 years ago
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