Let r = 3. What is the value of r + 58?

Every counting number is a rational number true or false

ra1l [238]

<h3>Answer: True</h3>

Reason:

The counting numbers, aka the set of natural numbers, is the set {1, 2, 3, 4, 5, ...} which is the set of positive integers

A value like 5 is the same as 5/1, which shows it is rational.

A rational number is any fraction of two whole numbers (eg: 2/3 and 4/7). The denominator cannot be zero.

Since we can rewrite the 5 as 5/1, it can be done with any counting number to show the natural numbers is a subset of the rational numbers.

Any counting number is rational, but not the other way around.

6 0

2 years ago

Which of the following is the definition for permutation?

Kamila [148]

Answer:

The answer is D. Selections of objects in which the order of the objects matters.

Step-by-step explanation:

Permutation is an arrangement of all or part of a set of objects, with regard to the order of the arrangement.

The formula for permutation: A permutation is the choice of (r) things from a set of (n) things without replacement and where the order matters. Formula-

$nPr= \frac{n!}{(n-r)!}$

Permutation can be classified in three different categories:

Permutation of (n) different objects (when repetition is not allowed)

Repetition, where repetition is allowed

Permutation when the objects are not distinct (Permutation of multi sets)

8 0

3 years ago

Will give Brainly to the best answer!!!!! Please help!!!!

Ipatiy [6.2K]

Answer:

x=-1

Step-by-step explanation:

here is an example for my class, these really helped

A quadratic equation is any second-degree polynomial equation — that’s when the highest power of x, or whatever other variable is used, is 2. The solution or solutions of a quadratic equation,

Solve the equation,

with the quadratic formula:

Bring all terms to one side of the equation, leaviign

Plug the coefficients into the formula.

In this example, a equals 2, b is –5, and c is –12, so

You can also use the quadratic formula for factoring trinomials.

Here’s what you do.

Use the quadratic formula to get solutions for x. (You can also use your calculator to get the solutions.) Make sure the solutions are written as fractions rather than as decimals and that they’re reduced to lowest terms.

Take the two solutions and put them in factors. If a solution is positive, use subtraction. If a solution is negative, use addition.

If either solution is a fraction, take the denominator and bring it in front of the x.

And, voilà, the trinomial is factored:

(x – 4)(2x + 3)

4 0

3 years ago

Read 2 more answers

The table below shows some inputs and outputs of the invertible function f with domain all real numbers. NEED HELP NOW!!!!!

Serggg [28]

Answer:

( 1 ) $f^{-1}(f(576)) = 576$ ,

( 2 ) $f^{-1}(-7)+f(-7) = 13$

Step-by-step explanation:

Taking the function and it's inverse, it should be the following property -

$f^{-1}(f(x))= x$ - this therefore makes the functionality " $f^{-1}(f(576))= x$ " equivalent to 576 itself.

For this second part here let's consider the portion " $f(-7)$ " firstly. As you can see from the table, - 7 should represent the x - value, hence $f(-7) = 7$ . Now for this second bit here, we have to take the inverse - making the what should have been the x - value, now the f( x ) value. Therefore, $f^{-1}(-7) = 6$ .