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
Sholpan [36]
3 years ago
14

If -10x – 9y = -7 is a true equation, what would be the value of -30x – 27y?

Mathematics
1 answer:
Tpy6a [65]3 years ago
8 0

Answer:

-30x-27y = -21

Step-by-step explanation:

We know that;

-30x-27y = 3(-10x-9y)

Recall, -10x-9y = -7

Thus; -30x-27y = 3(-7) = -21

You might be interested in
69 min equals how many hours and min
natali 33 [55]

Answer:

One hour and nine minutes

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Which is the equation of a line that passes through the point (3,-4) and has a slope of 2.
Travka [436]

Answer:

y = 2x - 10

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Here m = 2, thus

y = 2x + c ← is the partial equation

To find c substitute (3, - 4) into the partial equation

- 4 = 6 + c ⇒ c = - 4 - 6 = - 10

y = 2x - 10 ← equation of line

6 0
3 years ago
13 times an unknown number added to 72 equals -23 times the unknown number.what is the solution to the sentence ?
Alika [10]
Let the unknown number be x
13x+72= -23x
13x+23x= -72
36x= -72
x= -2
6 0
3 years ago
Read 2 more answers
Solve proporation h/9=2/3
serious [3.7K]
H = 6. if you were to plug in 6 and simplify, if would be 2/3.
8 0
3 years ago
Suppose a research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. A samp
shutvik [7]

Answer:

0.9910 = 99.10% probability that a sample of 170 steady smokers spend between $19 and $21

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Mean of 20, standard deviation of 5:

This means that \mu = 20, \sigma = 5

Sample of 170:

This means that n = 170, s = \frac{5}{\sqrt{170}}

What is the probability that a sample of 170 steady smokers spend between $19 and $21?

This is the p-value of Z when X = 21 subtracted by the p-value of Z when X = 19.

X = 21

Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

Z = \frac{21 - 20}{\frac{5}{\sqrt{170}}}

Z = 2.61

Z = 2.61 has a p-value of 0.9955

X = 19

Z = \frac{X - \mu}{s}

Z = \frac{19 - 20}{\frac{5}{\sqrt{170}}}

Z = -2.61

Z = -2.61 has a p-value of 0.0045

0.9955 - 0.0045 = 0.9910

0.9910 = 99.10% probability that a sample of 170 steady smokers spend between $19 and $21

3 0
3 years ago
Other questions:
  • Find the area of the following ellipse.
    11·1 answer
  • Use the listing method to represent the following set. { x | x I, 2 ≤ x ≤ 5}
    10·2 answers
  • Ive been stuck on this question for 4 hours someone please help me
    7·1 answer
  • Karen bought a coat for 10% more than the price she wanted to pay. If she paid $242, how much was she looking to pay?
    14·1 answer
  • Find the measures of all four angles if m∠2 − m∠1=30°
    5·1 answer
  • Which of the following rational numbers is greater than 5/17 but less than 6/17.
    8·1 answer
  • The first season of the show breaking bad contain seven episodes but the second season of 13 episodes calculate the absolute and
    15·2 answers
  • Pls help due asap. Please
    10·2 answers
  • Find all the missing elements. NEED HELP PLZZZZ
    13·1 answer
  • Rockport had 5,620 residents at the time of its founding. Currently there are 3,934 residents. What is the percent of decrease i
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!