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
Svetlanka [38]
2 years ago
7

Loretta swam 3 laps in 12.09 seconds. If she swam these three laps equally as fast, how long did it take her to swim two laps

Mathematics
1 answer:
JulsSmile [24]2 years ago
4 0

Answer:

4.03 Seconds

Step-by-step explanation:

12.09 divided by 3 laps

You might be interested in
A spinner has an equal chance of landing
liq [111]

Answer:

1/15

Step-by-step explanation:

since there are 3 equal colors, they're all 1/3

since it's 5, it's 1/5

1/5 x 1/3

1/15

7 0
2 years ago
The manager of a supermarket would like to determine the amount of time that customers wait in a check-out line. He randomly sel
garri49 [273]

Complete question:

The manager of a supermarket would like to determine the amount of time that customers wait in a check-out line. He randomly selects 45 customers and records the amount of time from the moment they stand in the back of a line until the moment the cashier scans their first item. He calculates the mean and standard deviation of this sample to be barx = 4.2 minutes and s = 2.0 minutes. If appropriate, find a 90% confidence interval for the true mean time (in minutes) that customers at this supermarket wait in a check-out line

Answer:

(3.699, 4.701)

Step-by-step explanation:

Given:

Sample size, n = 45

Sample mean, x' = 4.2

Standard deviation \sigma = 2.0

Required:

Find a 90% CI for true mean time

First find standard error using the formula:

S.E = \frac{\sigma}{\sqrt{n}}

= \frac{2}{\sqrt{45}}

= \frac{2}{6.7082}

SE = 0.298

Standard error = 0.298

Degrees of freedom, df = n - 1 = 45 - 1 = 44

To find t at 90% CI,df = 44:

Level of Significance α= 100% - 90% = 10% = 0.10

t_\alpha_/_2_, _d_f = t_0_._0_5_, _d_f_=_4_4 = 1.6802

Find margin of error using the formula:

M.E = S.E * t

M.E = 0.298 * 1.6802

M.E = 0.500938 ≈ 0.5009

Margin of error = 0.5009

Thus, 90% CI = sample mean ± Margin of error

Lower limit = 4.2 - 0.5009 = 3.699

Upper limit = 4.2 + 0.5009 = 4.7009 ≈ 4.701

Confidence Interval = (3.699, 4.701)

5 0
3 years ago
Gordon can type 800 words in 5
qwelly [4]

Answer: hewo, your answer is below

160 wpm is the correct answer

Step-by-step explanation:

Hope this helps !!!

Have a great day !!!!

Plz Mark branilest ^w^

4 0
3 years ago
Read 2 more answers
A line passes through points (0,k) and (2,0) and has a slope of -1.5.
Contact [7]

Answer:

The equation of the line is y = -1.5x + 3

The y-intercept is (0,3)

The value of k is 3.

Step-by-step explanation:

y - 0 = -1.5 (x - 2)

y = -1.5x + 3

4 0
3 years ago
Is the perimeter of the composite figure equal to the sum of the perimeters of the individual figures? Explain by selecting all
DIA [1.3K]

Answer: No the third one , you have to find the distance around the figure

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Other questions:
  • A tiger traveled 3.5 km, then turned around and traveled 1,250 m back toward his starting point. How many meters was he from his
    10·2 answers
  • a triangle has the following measurements : a=19 b=25 c=31 use the law of cosines to find the missing measurements
    10·1 answer
  • John and his family went out to eat at their favorite restaurant's the bill for the food was $65 and I left a 20% tip for the se
    14·2 answers
  • Ridley bought 3 3/4 yards of blue fabric,12 5/6 yards of red fabric,and 7 2/3 yards of purple fabric.if she paid $7.50 per yard,
    6·1 answer
  • The value of a house is expected to increase by 5% per year over the next several years. The current value of the house is $175,
    15·1 answer
  • Find the scale factor of the dilation. Then tell whether the dilation is a reduction or an enlargement.
    10·1 answer
  • Find the area of the following figure round to the nearest​
    11·1 answer
  • 10.<br> Write and solve an<br> equation that means “a number (n) divided by 4, plus 3 is 7."
    5·2 answers
  • In simplest form, 3/5 of the<br> students ride the bus to school.
    5·1 answer
  • Very hard problem someone help
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!