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
taurus [48]
3 years ago
13

The numbers x and y are inversely proportional. When the sum of x and y is 42, x is twice y. What is the value of y when x = -8?

PLEASE HELP
Mathematics
1 answer:
dolphi86 [110]3 years ago
4 0

Answer:

y= -4

Step-by-step explanation:

x+y=42.   We know that x plus y equals 42.

x=2y .   We also know that x equals twice y.

2y+y=42.   Since we know that x=2y, we're going to replace x with 2y from the original equation, simplified would be 3y=42.

y=14.   3y=42 simplified is y=14, this is because we divided both sides by 3 (since 3 and 42 are both divisible by 3) (btw divisible by 3 simply means that it can be divided by 3)

x+14=42.   Now that we know what y equals, let's replace y with 14 from the original equation.

x=28.  Now that we know that x=28 and y=14, we know that y is always x/2.

When x=-8, we divide it by 2 and get, -4.

Not absolutely positive as this was all mental math, but hope this helps! :)

You might be interested in
Can someone please help will mark brainlist
Virty [35]

Answer:

You can complete the mission 5 times before you earn less than 400 points.

Explanation:

100(0.8)^n^-^1 < 400

(0.8)^n^-^1 < 0.4

log 0.8^n < log 0.32

n > 5.1

8 0
2 years ago
A grower believes that one in five of his citrus trees are infected with the citrus red mite. How large a sample should be taken
kotegsom [21]

Answer: 68

Step-by-step explanation:

Formula for sample size when prior estimate of population proportion (p) is available:  n=p(1-p)(\dfrac{z^*}{E})^2

, where z*= critical-value.

E= Margin of error.

Let p be the population proportion of  trees are infected with the citrus red mite.

As per given , we have

p=\dfrac{1}{5}=0.2

E= ± 0.08

The critical z-value corresponding to 90% confidence level = z*=1.645

Substitute all the values in the above formula , we get

Required sample size  :n=(0.2)(1-0.2)(\dfrac{(1.645)}{0.08})^2

\Rightarrow\ n=(0.2)(0.8)(20.5625)^2

\Rightarrow\ n=0.16(422.81640625)\\\\\Rightarrow\ n=67.650625\approx68 [Rounded to next integer.]

Thus, the minimum sample size should be taken =68

6 0
3 years ago
Kayla says that the point labeled C in the diagram below is the center. Raymond says that point C is the radius.
frutty [35]

Answer:

Kayla is correct The center is a fixed  point in the middle of the sphere

Step-by-step explanation:

In mathematics we have certain habit of rules for notation of points, coordinates, segments, angles and so on.

Usually we denote points,  by letters even more we denote with the first letter of the object we are denoting

Occasionally, we also denote  segments as radius in a circle and in a sphere, with letters,  that is r stands for  radius, h stands for height, in most cases we denote point for capital letters ( in a segment)  

When we denote radius, with small letter it should be placed at the center or over the segment we are traying to denote.

For points we only need to place the letter close to the to the point we want to denote.

Therefore Kayla is correct when says that c stand for " the center of the sphere"

8 0
3 years ago
Read 2 more answers
20 PTS LOOK AT PIC FOR QUESTION WILL MARK BRAINILEST
hjlf

Answer:

263.25 cm

Step-by-step explanation:

5 0
3 years ago
What is the slope of the line that passes through the points (-10,5) and (3,4)
steposvetlana [31]

Answer:

-1 / 13

Step-by-step explanation:

(x 1,y1)  = (-10,5)

(x2, y2) = (3,4)

y2 - y1 / x2 - x1

8 0
3 years ago
Read 2 more answers
Other questions:
  • What is the value of | -17 |, which is read, "the absolute value of 17"?
    9·1 answer
  • Is 2.375 a rational or a irrational number
    11·2 answers
  • Please help asaappppppp
    7·1 answer
  • Kara's backpack contains 4 boxes of pencils. Each box contains "p" pencils. Kara's back also contains 6 pens. Write three equiva
    7·1 answer
  • Carlotta is making blue and orange necklaces in several lengths. For each necklace, her ratio of blue beads to orange beads is 3
    6·1 answer
  • How many punches does it take for Saitama(one punch man) to kill Vaccine man??<br><br> Free points
    10·2 answers
  • What is the cosine ratio of ∠Z?
    6·2 answers
  • Plz help I need help
    12·1 answer
  • Write the converse of the following statement. Then determine its validity.
    13·1 answer
  • The scale model of a car is 5% of the size of the actual car. The length of
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!