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
Montano1993 [528]
3 years ago
5

What is the result when the number 84 is decreased by 50%?

Mathematics
2 answers:
natka813 [3]3 years ago
3 0

Answer:

42

Step-by-step explanation:

alekssr [168]3 years ago
3 0

Answer:

42

<h2> 84 ×50%by100 =42. 84-42= 42. hope helpful answer</h2>
You might be interested in
If a random sample of size nequals=6 is taken from a​ population, what is required in order to say that the sampling distributio
goldenfox [79]

Answer:

\bar X \sim N(\mu , \frac{\sigma}{\sqrt{n}})

In order to satisfy this distribution we need that each observation on this case comes from a normal distribution, because since the sample size is not large enough we can't apply the central limit theorem.

Step-by-step explanation:

For this case we have that the sample size is n =6

The sample man is defined as :

\bar X = \frac{\sum_{i=1}^n X_i}{n}

And we want a normal distribution for the sample mean

\bar X \sim N(\mu , \frac{\sigma}{\sqrt{n}})

In order to satisfy this distribution we need that each observation on this case comes from a normal distribution, because since the sample size is not large enough we can't apply the central limit theorem.

So for this case we need to satisfy the following condition:

X_i \sim N(\mu , \sigma), i=1,2,...,n

Because if we find the parameters we got:

E(\bar X) =\frac{1}{n} \sum_{i=1}^n E(X_i) = \frac{n\mu}{n}=\mu

Var(\bar X)= \frac{1}{n^2} \sum_{i=1}^n Var(X_i) = \frac{n\sigma^2}{n^2}= \frac{\sigma^2}{n}

And the deviation would be:

Sd (\bar X) = \frac{\sigma}{\sqrt{n}}

And we satisfy the condition:

\bar X \sim N(\mu , \frac{\sigma}{\sqrt{n}})

3 0
3 years ago
Breoz
Viktor [21]

The second statement is:

B: a + b = b + a

Which is the commutative property, so we know that this statement is true.

<h3>Which statement is always true?</h3>

Remember that for integer numbers, we have the following properties:

  • Commutative property: A + B = B + A
  • Associative property: (A + B) + C = A + (B + C)

Now, in this case we know that a and b are integer numbers, first we can see that the second statement is:

B: a + b = b + a

Which is the commutative property, so we know that this statement is true.

The other 3 statements are false. You can see it by evaluating a = 0 and b = 1.

If you want to learn more about addition:

brainly.com/question/25421984

#SPJ1

6 0
1 year ago
What is the quotient of 787/2 then estimate
marishachu [46]
The answer is 393.5  
Estimate it to 800 divided by 2
6 0
3 years ago
Read 2 more answers
The length of a rectangular photo is 1 centimeter less than three times its width. If the area of the photo is 102 square centim
noname [10]

Answers:

  • Length = 17
  • Width = 6

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

How to get those answers:

Let w be the unknown width in centimeters. This variable is some positive real number. This means w > 0 which will be useful later.

The length is "1 cm less than 3 times its width" and it tells us the length is defined by the expression 3w-1. Whatever w is, we triple it to get 3w and then subtract 1 to get the final length.

Multiply the length and width to get the area 102

length*width = area

(3w-1)*w = 102

3w^2-w = 102

3w^2-w-102 = 0

We could guess and check our way to factoring this, but that's not very efficient. The quadratic formula is the better option. It may seem a bit messy, but it's a more direct path that doesn't involve guessing.

w = \frac{-b\pm\sqrt{b^2-4ac}}{2a}\\\\w = \frac{-(-1)\pm\sqrt{(-1)^2-4(3)(-102)}}{2(3)}\\\\w = \frac{1\pm\sqrt{1225}}{6}\\\\w = \frac{1\pm35}{6}\\\\w = \frac{1+35}{6}\ \text{ or } \ w = \frac{1-35}{6}\\\\w = \frac{36}{6}\ \text{ or } \ w = \frac{-34}{6}\\\\w = 6\ \text{ or } \ w \approx -5.667\\\\

We ignore the second solution (w = -5.667 approximately) because we stated earlier that w > 0. In other words, a negative length does not make sense, so that's why we ignore it.

-----------------

If w = 6 cm is the width, then 3w-1 = 3*6-1 = 18-1 = 17 cm is the length.

Note that length*width = 17*6 = 102 which is the proper area we want. This confirms the answers.

6 0
3 years ago
Need help asap please!!
tamaranim1 [39]

Answer:

A) 40 + d

B) 45 days

Step-by-step explanation:

A)

total cost = (cost of the air conditioner itself) + (money charged per day)*(days)

cost of air conditioner itself = $40

money charged per day = $1

days = d

40 + 1*d

= 40 + d

B)

total cost = 40 + d

total cost = $85

85 = 40 + d

45 = d

Time used the air conditioner for 45 days.

6 0
3 years ago
Other questions:
  • Please help! Geometry!
    14·1 answer
  • If you were going to make a curtain for a window that was two and a half feet wide and three and a half feet high, what size wou
    8·1 answer
  • Find the definite integral from 0 to 1/16 of arcsin(8x)/sqrt(1-64x^2)dx
    13·1 answer
  • A man bought a bicyicle at sh 3000 and sold it at a profit of 5% how much did he sell at?
    14·1 answer
  • PLEASE HELP ILL MARK U THE BRAINLIEST IT IS URGENT AND ITS GEOMETRY DONT WASTE ANSWERS PLEASE
    8·1 answer
  • Help plz I need it ASAP give poinys
    5·2 answers
  • A bag contains nine red balls, four green balls, and fifteen yellow balls. What is the probability of pulling out one red ball?
    13·1 answer
  • Find the value of z<br> A.110<br> B.141<br> C.80<br> D.100
    12·1 answer
  • Ms. Mendez ate 18 red skittles, which represented 24% of the entire packet. How many skittles were in the entire packet?
    9·1 answer
  • M is the midpoint of XY. Find XY. MX = 2x+10 and MY = 3x-5
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!