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
Luba_88 [7]
3 years ago
8

Please help need help

Mathematics
1 answer:
DIA [1.3K]3 years ago
4 0
The answer is -10+(-90)+(-40)
You might be interested in
Plz, Help me with this question.
UNO [17]

Answer:

first option

Step-by-step explanation:

Given

area = 15x - 9 ← factor out 3 from each term

       = 3(5x - 3)

Thus the dimensions are 3 by (5x - 3)

6 0
2 years ago
Read 2 more answers
In a study to establish the absolute threshold of hearing, 80 male college freshmen were each seated in a soundproof room and a
Norma-Jean [14]

Answer:

Step-by-step explanation:

Hello!

To study the threshold of hering the researcher took a random sample of 80 male college freshmen.

The students underwent an audiometry test where a tome was played and they had to press a button when they detected it.  The researcher recorded the lowest stimulus level at which the tone was detected obtaining a sample mean of X[bar]= 22.2 dB and a standard deviation of S= 2.1 dB

To estimate the population mean, since we don't have information about the variable distribution but the sample size is greater than 30, you can use the approximation of the standard normal distribution:

X[bar] ± Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Where the semiamplitude or margin of error of the interval is:

d= Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Using a 95% level Z_{0.975}= 1.965

d= 1.965 * \frac{2.1}{\sqrt{80} }

d= 0.46

The point estimate of the population mean of the threshold of hearing for male college freshmen is X[bar]= 22.2 db

And the estimation using a 95%CI is [21.74;22.66]

I hope this helps!

8 0
3 years ago
WILL GIVE BRAINLIEST! (Only for the first CORRECT Answer, though)
Rzqust [24]

Answer:

Plane A will be farther because it is flying at a lower angle so it will be able to cover more ground by flying slightly more forwards than going more upwards like plane B

4 0
3 years ago
Read 2 more answers
A dime has a radius of about 0.85 cm what is the closest circumfrence
Anuta_ua [19.1K]
5.34 cm. Hope I helped!
4 0
2 years ago
5cm<br> 2cm<br> 8cm<br> Volume of 3D shape
11Alexandr11 [23.1K]

Answer:

80 cm^3 (cm cubed)

Step-by-step explanation:

5 x 2 x 8

4 0
2 years ago
Other questions:
  • Need help how can i do this?
    8·2 answers
  • A teacher asked the class to solve the equation 3(x + 2) = 21.
    8·2 answers
  • How do I find the area???
    14·1 answer
  • 2. Ms. Lenz has these dollar bills. Count on
    10·2 answers
  • Can someone explain this to me.
    5·1 answer
  • If only the height of a pyramid is doubled its volume is Also doubled true or false
    12·1 answer
  • What is 3<br> —<br> 8 <br> Times 40 I’m simplest form
    15·1 answer
  • Aniah printed 1-page fliers. She used a printer that can print 1 page every 4.25 seconds. How long did it take her to print 58 f
    13·2 answers
  • Find 95% of 83. do not round your answer.
    11·2 answers
  • 4.<br> A straight line passes through points (3, 12) and (7,4). What is the equation of the line?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!