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
JulijaS [17]
3 years ago
7

When two-fifths of a number is increased by 15 the result is 27. What is the number?

Mathematics
1 answer:
user100 [1]3 years ago
7 0

Answer:

x = 30

Step-by-step explanation:

Let's set up an equation to represent this problem:

2/5 * x + 15 = 27

subtracting 15 from both sides,

2/5 * x = 12

Multiplying 5/2 to both sides,

5/2 * 2/5 * x = 12 * 5/2

1*x = 30

x = 30

You might be interested in
What is the midpoint of the line segment with endpoints (-1,7) and (3, -3)?
Elodia [21]
The correct answer is A. (1, 2)
4 0
3 years ago
When studying radioactive material, a nuclear engineer found that over 365 days,
Gnom [1K]

Answer:

a) The mean number of radioactive atoms that decay per day is 81.485.

b) 0% probability that on a given day, 50 radioactive atoms decayed.

Step-by-step explanation:

Poisson distribution:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

P(X = x) = \frac{e^{-\lambda}*\lambda^{x}}{(x)!}

In which

x is the number of sucesses

e = 2.71828 is the Euler number

\lambda is the mean in the given interval.

a. Find the mean number of radioactive atoms that decayed in a day.

29,742 atoms decayed during 365 days, which means that:

\lambda = \frac{29742}{365} = 81.485

The mean number of radioactive atoms that decay per day is 81.485.

b. Find the probability that on a given day, 50 radioactive atoms decayed.

This is P(X = 50). So

P(X = 50) = \frac{e^{-81.485}*(81.485)^{50}}{(50)!} = 0

0% probability that on a given day, 50 radioactive atoms decayed.

5 0
3 years ago
Solve the equation.<br> 1. -66 = -9n+ 16 + 4<br> n = 4<br> b. n = 10
prisoha [69]

Answer:

b

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Write the following decimal number in its equivalent fraction form. Show all work for full credit.
Zigmanuir [339]
<span>Let x=0.8888... 

x=0.8888 Start with the given equation 

10x=8.8888 Multiply both sides by 10. The goal is to move the decimal point to the next repeating portion (which is just one spot to the right) 



 Now subtract the equation x=0.8888 from 10x=8.8888 to get 
10x-x=8.8888-0.8888 

9x=8 Combine like terms. Notice how the decimal portions cancel out. 

x=8/9 Divide both sides by 9 to isolate x 

So the answer is x=8/9 which means that 8/9=0.8888 (where the 8's repeat)</span>
 
8 0
3 years ago
Austins movie collections contains 9 movies, including 3 comedies. What is the probability that a randomly selected movie will b
storchak [24]

Answer:

There is a 3 in 9 chance

Step-by-step explanation:

4 0
3 years ago
Other questions:
  • Can you guys help out please asap
    13·1 answer
  • The slope of the _________________ is determined by the relative price of the two goods, which is calculated by taking the price
    5·1 answer
  • What is 22.5 as a fraction in simplest form
    12·1 answer
  • The summation of 1 to infinity of n - 2 is which of the following series?-2, -4, -6, -8, . . .-2, -1, 0, 1, . . .-1, 0, 1, 2, .
    5·1 answer
  • 2(x+8)=2x-8 true or false
    14·1 answer
  • Identify the area of the trapezoid. Please help!
    11·2 answers
  • Helpp pleasee! 2/9!!!!!
    5·1 answer
  • Solve the equation 2[x]&gt;14
    13·1 answer
  • Hep me again please willl give brainliest
    6·2 answers
  • Iddijdishsjsjssjsjdjdj
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!