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
g100num [7]
2 years ago
14

A submarine is at the depth of -300 meters. It is rising 50 meters every hour. What is the depth of the submarine after 4 hours?

Mathematics
1 answer:
Alona [7]2 years ago
4 0
The answer is -100. This is because 50 x 4 = 200 and -300+200=-100
You might be interested in
How do I write an equation for #17?
Svetllana [295]
16.95x + .05y = 22.95x + .02y
8 0
3 years ago
Read 2 more answers
what is an equation of the line that s perpendicullar to y-3=-4(x+2) and passes through the point (-5,7)
Sidana [21]

Answer:

4y=x+33

y=x/4+33/4 (slope-intercept form)

Step-by-step explanation:

y-3 = -4(x+2)

y-3 -4x-8

y= -4x-8+3

y= -4x-5

m1 = -4

For perpendicularity

m2= -1/-4 = 1/4

The equation is

y-y1 = m2(x-x1)

y-7 = 1/4(x-(-5))

y-7 = x/4+5/4

Multiply through by 4

4y-28=x+5

4y=x+5+28

4y=x+33

Divide through by 4

y=x/4+33/4 (slope-intercept form)

7 0
3 years ago
In the given figure if ab=bc and bx=by
kirill [66]

where`s the figure?????

6 0
3 years ago
Suppose a 90% confidence interval for the mean salary of college graduates in a town in Mississippi is given by [$38,737, $50,46
JulsSmile [24]

Answer:

a. The point estimate was of $44,600.

b. The sample size was of 16.

Step-by-step explanation:

Confidence interval concepts:

A confidence interval has two bounds, a lower bound and an upper bound.

A confidence interval is symmetric, which means that the point estimate used is the mid point between these two bounds, that is, the mean of the two bounds.

The margin of error is the difference between the two bounds, divided by 2.

a. What is the point estimate of the mean salary for all college graduates in this town?

Mean of the bounds, so:

(38737+50463)/2 = 44600.

The point estimate was of $44,600.

b. Determine the sample size used for the analysis.

First we need to find the margin of error, so:

M = \frac{50463-38737}{2} = 5863

Relating the margin of error with the sample size:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.9}{2} = 0.05

Now, we have to find z in the Z-table as such z has a p-value of 1 - \alpha.

That is z with a pvalue of 1 - 0.05 = 0.95, so Z = 1.64.

Now, find the margin of error M as such

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

For this problem, we have that \sigma = 14300, M = 5863. So

M = z\frac{\sigma}{\sqrt{n}}

5863 = 1.645\frac{14300}{\sqrt{n}}

5863\sqrt{n} = 1.645*14300

\sqrt{n} = \frac{1.645*14300}{5863}

(\sqrt{n})^2 = (\frac{1.645*14300}{5863})^2

n = 16

The sample size was of 16.

7 0
3 years ago
Three cards are chosen from a standard deck of 52 playing cards with replacement what is the orobsbility every card will be a he
Ne4ueva [31]
1/4 x 1/4 x 1/4 = 1/64

There is a 1/64 chance that they will all be hearts.
7 0
3 years ago
Other questions:
  • Show that the sets of upper-triangular and lower-triangular matrices are subspaces of F n,n . Call them U and L respectively. Wh
    10·1 answer
  • The distance between Ben's house and the school is 2.6 km. The distance between the school and the church is 550. What is the to
    6·1 answer
  • Carowinds has a fun day for elementary schools.Students get to go explore and learn at the park.Carowinds wants 5,450 students t
    8·1 answer
  • I NEED HELP WITH THIS
    11·2 answers
  • 5lb divided 8 3/4 cup
    8·1 answer
  • Twenty years from now, you want to spend $175,000 for a fancy car. How much must you deposit as a lump sum today to achieve this
    8·1 answer
  • Examine the paragraph proof. Which theorem does it offer proof for?
    14·2 answers
  • There is a bag filled with 4 blue and 5 red marbles.
    13·1 answer
  • On Sunday, Antonio spent total of 3/1/4 hours driving and 1/3/4 hours gardening. How much longer did he spend driving write your
    12·2 answers
  • A bag contains exactly three red marbles, five yellow marbles and two blue marbles. If three marbles are drawn from the bag with
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!