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
Lunna [17]
3 years ago
13

Find the product -4(3x-5)

Mathematics
1 answer:
lutik1710 [3]3 years ago
5 0

Answer: -12x+20; x=-\frac{5}{3}

Step-by-step explanation:

-4(3x-5)\\-4(3x)-(-4)5\\-12x-(-20)\\-12x+20\\\frac{-12x}{-12}=\frac{20}{-12}\\  x=-\frac{20}{12} =-\frac{5}{3}

You might be interested in
In a large population, 82% of the households have cable tv. A simple random sample of 225 households is to be contacted and the
anzhelika [568]

Answer:

The mean of the sampling distribution of the sample proportions is 0.82 and the standard deviation is 0.0256.

Step-by-step explanation:

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.

For proportions, the mean is \mu = p and the standard deviation is s = \sqrt{\frac{p(1-p)}{n}}

In this problem, we have that:

p = 0.82, n = 225.

So

\mu = 0.82

s = \sqrt{\frac{p(1-p)}{n}} = \sqrt{\frac{0.82*0.18}{225}} = 0.0256

The mean of the sampling distribution of the sample proportions is 0.82 and the standard deviation is 0.0256.

7 0
3 years ago
Read 2 more answers
Suppose a bag contains many marbles, 54% of which are purple. You draw 5 marbles from the bag with replacement.
dolphi86 [110]

Part A

Use the binomial probability distribution formula.

p = 0.54 = probability of getting a purple marble

n = 5 = sample size

x = 2 = number of purple we want to get

P(x) = \frac{n!}{x!(n-x)!}*p^x*(1-p)^{n-x}\\\\P(2) = \frac{5!}{2!(5-2)!}*0.54^2*(1-0.54)^{5-2}\\\\P(2) = 10*0.54^2*0.46^3\\\\P(2) = 0.283831776\\\\

The \frac{n!}{x!(n-x)!} portion is from the nCr combination formula. The exclamation marks indicate a factorial.

Alternatively, you could use Pascal's Triangle for that portion.

<h3>Answer: 0.283831776</h3>

This decimal value is exact. Round it however you need to.

============================================================

Part B

To find the expected value, aka the mean, we multiply the sample size and probability of getting a purple marble on any single selection.

n*p = 5*0.54 = 2.7

<h3>Answer: 2.7</h3>
6 0
2 years ago
Jamal is x years old. His mother is 28 years older than Jamal. Jamal's uncle is two times older than Jamal's mother. Write and s
eimsori [14]

Answer:

28x^2= y

x = jamal age

y= jamal's uncle age

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Which inequality does the graph represent?
polet [3.4K]
It would have to be number 2 if it's a dotted line, all the other options are incorrect unless you made a mistake with one or two of the symbols.
4 0
3 years ago
Andrea spins the arrow on the spinner one time.
insens350 [35]

My Answer for your question is

A. O

4 0
3 years ago
Other questions:
  • Mrs. Mathews buys deli meat for her kids lunches every week. This week she buys 3.75 pounds of ham. If she used 0.25 pounds of h
    12·1 answer
  • If ƒ (x ) = 2x 2 + 3, find ƒ (3).
    7·2 answers
  • A taxi charges a flat rate of $3.00, plus an additional $0.50 per mile. Carl will only take the taxi home if the cost is under $
    6·2 answers
  • the circle is centered at the point (3,2), and the length of its radius is 5. what is the equation of the circle?
    12·2 answers
  • What is 130%of20$???!!!!!
    14·2 answers
  • Estimate quotient using multiple 53÷3
    14·1 answer
  • A figure formed by two rays that have the same endpoint
    6·1 answer
  • If -1 is subtracted from 5, what will be the result?
    10·1 answer
  • Which statement describes the relationship between x and y? O As x increases, y decreases. O As x increases, y increases. O As x
    10·1 answer
  • Which relation is not a function? Reporting wrong answers.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!