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kumpel [21]
3 years ago
10

Which biconditional statement is true?

Mathematics
1 answer:
sineoko [7]3 years ago
7 0
Let us evaluate the given statements.
A, A number is divisible by 9 if and only is it ends in 3.
     23/9 is not divisible.
     FALSE

B.  A quadrilateral is a square if and only if it has four right angles.
     A rectangle is a quadrilateral with four right angles, but it is not a square.
     FALSE

C. The sum of two integers is positive if and only if the two integers are
     positive.
     12 + (-10) = 2 (positive).
     FALSE

D. A number is an even number if and only if it is divisible by 2.
     Thi is true by definition.
     TRUE 

Answer: D

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What are effective elements to include in introductions? Check all that apply.
dlinn [17]

The effective elements to include in the introductions are statement of the topic, a relevant anecdote and a surprising fact about the topic. Therefore the option 1st, 2nd and 6th options are correct.

<h3>What is Introduction? </h3>

Introduction is the starting line or the opening hook or portion that attracts the readers attention which carries the relevant background of the information.

It is the statement which represents the main point of the following argument or the paragraphs.

There are many elements that included in the introductory part some of them are as follows:-

  • a statement of the topic
  • a relevant anecdote or tale
  • a surprising fact about the topic

Therefore the option 1st, 2nd and 6th options are correct.

Learn more about Introduction here:

brainly.com/question/3964580

#SPJ1

7 0
2 years ago
Read 2 more answers
What is the solution to the equation 14 ^ (x + 3) = 21?
Rina8888 [55]
The answer to your question is b
8 0
3 years ago
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if a pound of grapes cost $0.14 in 1960 and the price of grapes increased at the same rate as the CPI from 1960 to 1980 by appro
masya89 [10]

The CPI increased from 29.6 to 82.4.  

The rate of increase, is:

82.4/29.6 = 2.78

Now multiply this rate to the $0.14 price of grapes from 1960.

$0.14 x 2.78 = $0.39

Now to get the amount of increase subtract the new price from the original price:

$0.39 - $0.14 = $0.25 increase.

5 0
3 years ago
What’s the answer to 6x + 3y =
Alex73 [517]

Answer:

The last answer; 12.

Step-by-step explanation:

In order to solve this, use substitution. Since it gives you an equation for y, substitute that equation in the other formula as y. This will give you:

6x+3(-2x+4)=?

Then simplify:

6x-6x+12=?

Since 6x - 6x cancels out, you are left with 12.

?=12\\


4 0
3 years ago
Read 2 more answers
A study was conducted to determine the mean birth weight of a certain breed of kittens. Consider the birth weights of kittens to
Scrat [10]
1) Call x the sample mean = 3.56

2) Call s the sample standard deviation = 0.2

3) Given that the variable is normally distributed and the sample is large, you determine the interval of confidence from:

x +/- Z(0.5) s/√n

Wehre Z(0.5) is the value of the probabilities over 5% (90% of confidence mean to subtract 10%, which is 5% for each side (tails) of the normal distribuition) and is taken from tables.

Z(0.5) = 0.3085

Then the inteval is

x +/- 0.385 *s /√n = 3.56 +/- 0.385 * 0.2/√45

3.56 +/- 0.011 = ( 3.549, 3.571). This is the answer.
8 0
3 years ago
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