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
Korolek [52]
2 years ago
11

Help !!!!!!!!!!!!!!!

Mathematics
1 answer:
Ostrovityanka [42]2 years ago
4 0

Answer:

  x = 29

Step-by-step explanation:

Follow the directions: substitute 13 for y in the first equation.

  x + 13 = 42

Subtract 13 from both sides of the equation.

  x +13 -13 = 42 -13

  x = 29

You might be interested in
A diagnostic test has a 95% probability of giving a positive result when given to a person who has a certain disease. It has a 1
stealth61 [152]

Answer:

a)0.2275   b)95/105=19/21    c)10/105= 2/21

Step-by-step explanation:

a) The case "The test result is positive" consists in 2 parts.

The 1st one is "The person has the desease (15%=0.15)  and the test's  result is positive (95%=0.95)

The probability of that is P(desease, positive) = 0.15*0.95=0.1425

The 2nd one is "The person has no the desease (100%-15%=85%=0.85). However the test result is positive (10%=0.1)

The probability of that is P(not desease, positive)=0.85*0.1=0.085

The total probability that test is positive is the sum of 1st and 2-nd parts of the case: P(pos) = 0.1425+0.085=0.2275

b) As it has been shown in a) The test result can be positive in case that the person is really has the desease (95%) and in case the person has no the desease (10%).  This actually means that 95 persons from 105  having positive test result are really has the desease.

So the probability that the test result is positive and person has the desease is P (desease/positive)= 95/105

c) It's clearly seen that the sum of  probabilities of b) and c)  equal 1.

Both events make full group of events.

If the test result is positive the person can have the desease or can have not the desease. So ( no desease/positive)= 1-95/105=10/105

6 0
2 years ago
Pls help will give brainliest!
Zolol [24]

Step-by-step explanation:

54 \frac{42 \sqrt{2 \sqrt[ \sqrt[2 \sqrt[22 \cot( \cot( \beta  \cot(?) ) ) ]{?} ]{?} ]{?} }  \times \frac{?}{?} }{?}  \times \frac{?}{?}  \times \frac{?}{?}

6 0
3 years ago
Lee is staying at a hotel. The cost of the first night is $240. The cost for each night after that is $210. Let y represent the
sveticcg [70]

Answer:

The situation represents the arithmetic sequence

Step-by-step explanation:

∵ The cost of the first night is $240

∵ The cost of each night after the first is $210

∵ The number of nights is x

∵ The total cost of staying at the hotel x nights is y

∴ y = 240 + 210(x - 1)

Put x = 1 , 2 , 3, 4 and then check the type of the sequence

∴ y = 240 + 210(1 - 1) = 240

∴ y = 240 + 210(2 - 1) = 450

∴ y = 240 + 210(3 - 1) = 660

∴ y = 240 + 210(4 - 1) = 870

∵ The difference between each two consecutive terms are constant

  (450 - 240 = 210 , 660 - 450 = 210 , 870 - 660 = 210)

∴ The sequence is arithmetic sequence

6 0
3 years ago
Read 2 more answers
In a standard deck of cards there are four suits: spades, clubs, hearts, and diamonds. Each suit has one each of 13 cards: ace,
pentagon [3]

Answer:

d

Step-by-step explanation:

yes on ed

4 0
3 years ago
Read 2 more answers
Consider the following confidence interval interpretation: We are 98% confident that the true mean laptop screen size is between
GalinKa [24]

Answer:

Incorrect

Step-by-step explanation:

This interpretation is incorrect because it states that 98% of the data is with in the confidence interval.

or 98% of the laptop have screen size between 19.2 and 21.4 inches

However, the interpretation would have been correct if it would have stated as - Value of the population mean i.e mean size of the laptop screen lies within the confidence interval.

7 0
3 years ago
Other questions:
  • (PLEASE HELP) 40 points + brainy
    6·2 answers
  • Please need help to solve this
    9·1 answer
  • If you multiply any number by zero, your answer will be
    7·2 answers
  • 3
    11·1 answer
  • The number of E.coli bacteria cells in a pond of stagnant water can be represented by the function below, where A represents the
    12·1 answer
  • Which equation represents the slope-interecept form of line below? y-intercept = (0,-6) slope = -5​
    10·1 answer
  • Alaska has a land area of about 1,700,00 square kilometers. Flordia has a land area one tenth the size of Alaska. What is the ar
    10·1 answer
  • A missing fraction ona number line is located exactly halfway between 3/6 and 5/6.what is the missing fraction?
    6·1 answer
  • Which expression is not an integer? A) -15 B) 6/14 C) 0 D) 12/6
    9·2 answers
  • Help eve hehedgrhhdhrgr
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!