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
katrin2010 [14]
3 years ago
7

I need help with my little brothers homework?

Mathematics
2 answers:
erik [133]3 years ago
7 0
I only did the first part but maybe later I will solve the rest too. If there are any errors but tell me so I can update the pic.

olya-2409 [2.1K]3 years ago
3 0
2. There is 10 different strings
3. I think you need to draw out the string lengths and then your done :)
You might be interested in
The waking time of a student under common conditions is normally distributed with mean of 30 hours and a standard deviation of 5
Elina [12.6K]

Answer:

If the walking time is greater than or equal to 38.225 hours, than it exceeds 95% probability that is lie in top 5%.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 30 hours

Standard Deviation, σ = 5 hours

We are given that the distribution of waking time is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

We have to find the value of x such that the probability is 0.95

P( X < x) = P( z < \displaystyle\frac{x - 30}{5})=0.95  

Calculation the value from standard normal z table, we have,  

\displaystyle\frac{x - 30}{5} = 1.645\\\\x = 38.225  

Thus, if the walking time is greater than or equal to 38.225 hours, than it exceeds 95% probability that is lie in top 5%.

4 0
3 years ago
8 cm<br> 6 cm<br> What is the area
Sonbull [250]

Answer:

48cm

Step-by-step explanation:

8 x 6

7 0
3 years ago
Read 2 more answers
Lupita bought 7 pounds of pretzels at a local wholesaler for $16.80. Her friend Charles bought 5 pounds of pretzels at the super
Galina-37 [17]

Answer:

Charly has the better buy

Step-by-step explanation:

The unit cost is

=16.8/7

=$2.4

Her friend Charles bought 5 pounds of pretzels at the supermarket for $12.75

Unit cost

=12.75/5

=$2.55

Charly got the best deal because the unit cost per item is less than that of the friend

3 0
3 years ago
For what value of k are the roots of the quadratic equation kx (x-2)+6=0 equal?​
ser-zykov [4K]

Answer:

\boxed{\sf k=6}

Step-by-step explanation:

\sf kx (x-2)+6=0

Expand brackets.

\sf kx^2 -2kx+6=0

This is in quadratic form.

\sf ax^2 +bx+c=0

Since this is for equal roots:

\sf b^2 -4ac=0

\sf a=k\\b=-2k\\c=6

\sf (-2k)^2 -4(k)(6)=0

\sf 4k^2-24k=0

\sf 4k(k-6)=0

\sf 4k=0\\k=0

\sf k-6=0\\k=6

Plug k as 0 to check.

\sf \sf 0x^2 -2(0)x+6=0\\6=0

False.

So that means k must equal 6.

3 0
3 years ago
4x −3/3 =7 what is x
ratelena [41]

Answer:

x = 6

Step-by-step explanation:

4x - 3 = 7×3

4x - 3 = 21

4x = 21 + 3

4x = 24

x = 6

I hope you understood the explanation!

4 0
3 years ago
Other questions:
  • Just an answer is needed, no explanation.
    12·2 answers
  • The table compares the daily average temperature in a park (in degrees Celsius) and the number of people who visited the park th
    14·2 answers
  • One night the king couldn't sleep, so he went down into the royal kitchen, where he found a bowl full of mangoes. being hungry,
    9·1 answer
  • 8 to the -2nd power times a to the 7th power
    5·1 answer
  • I am a multiple of 10. My factors include an even number and an odd number. I am greater than 3 x 5 and less than 4 x 7. What nu
    10·2 answers
  • PLEASE HELP QUICKLY
    5·2 answers
  • Solve by factoring:<br> X^2-13x-14=0
    9·1 answer
  • (You will get brainliest if you give a long answer) You have recently purchased a new backpack as show in the picture. The main
    15·1 answer
  • Help with both and I’ll give you...........
    8·1 answer
  • Evaluate the expression ​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!