Which number is not a composite number 2 9 15 21

Answers

Answer 1

Answer:

Number which is not a composite number is given by the equation A = 2

What are Factors of a Number?

Numbers that divide an original number evenly or precisely are known as its factors. A factor is a whole number that can divide a larger number in two equal parts. A factor is a number that divides another number, leaving no remainder

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given data ,

Let the equation be represented as A

Now , the value of A is

Let the set of number be in set C = { 2 , 9 , 15 , 21 }

And , composite number is a positive integer that can be formed by multiplying two smaller positive integers

So , the factors of 9 = 1 , 3 , 9

The factors of 15 = 1 , 3 , 5 , 15

The factors of 21 = 1 , 3 , 7 , 21

And , the factors of 2 are 1 and the number 2 itself

Therefore , the value of A = 2

Hence , the number 2 is a composite number

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Answer 2

Answer: 2 is not a composite number but it is actually a prime number because it is only divisible by one and itself and only composite numbers have more than just 2 factors so since 2 only has 2 factors, it is a prime number.

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A spinner number 1-10 is spun. Each number is equally likely to be spun. What is the probability of spinning: 1. an odd number OR a power of three?2. a number less than 8 OR a divisor of 15?

Answers

Answer:

B) Probability of number less than 8 OR a divisor of 15 = 1

Step-by-step explanation:

Given that the spinner number 1-10, therefore sample space = 10.

Each number is equally likely to be spun = 1/10 for each number.

A) probability of having an odd number OR a power of three?

Probability of odd number = number of odd number from 1-10 / sample space

Number of odd number = 5 {1,3,5,7,9}

Probability of odd number = 5/10 = 1/2

Probability of power of three = number of power of three from 1-10 / sample space

power of three from 1-10 = 1 (1x1x1) and 8 (2x2x2)

number of power of three from 1-10 = 2 {1,8}

Probability of power of three = 2/10

probability of having an odd number OR a power of three = probability of having an odd number + a power of three

probability of having an odd number OR a power of three = 5/10 + 2/10 = 7/10

B) probability of number less than 8 OR a divisor of 15

Number less than 8 = 7 {1,2,3,4,5,6,7}

Probability of number less than 8 = 7/10

Divisor of 15 from 1-10 = 3 {1,3,5}

Probability of divisor of 15 = 3/10

Probability of number less than 8 OR a divisor of 15 = probability of number less than 8 + a divisor of 15

Probability of number less than 8 OR a divisor of 15 = 7/10 + 3/10 = 10/10 = 1

The Probability of having an odd number OR a power of three is 7/10

The probability of a number less than 8 OR a divisor of 15 is 1.

What is the probability?

Probability refers to a possibility that deals with the occurrence of random events. The probability of all the events occurring need to be 1.

The formula of probability is defined as the ratio of a number of favorable outcomes to the total number of outcomes.

P(E) = Number of favorableoutcomes / total number of outcomes

It is given that the spinner number 1-10, So sample space = 10.

Each number is equally likely to be spun

A) probability of having an odd number OR a power of three

Probability of odd number = number of odd numbers / sample space

Number of odd number = {1,3,5,7,9}

Probability of odd number = 5/10

= 1/2

Probability of power of three = number of power of three / sample space

power of three from 1-10 = 1 and 8

number of power of three = 2

Probability of power of three = 2/10

Probability of having an odd number OR a power of three = probability of having an odd number + a power of three

= 5/10 + 2/10

= 7/10

Therefore, the probability of having an odd number OR a power of three is 7/10

B) Probability of number less than 8 OR a divisor of 15

Number less than 8 = {1,2,3,4,5,6,7}

Probability of number less than 8 = 7/10

Divisor of 15 from 1-10 = {1,3,5}

Probability of divisor of 15 = 3/10

Probability of number less than 8 OR a divisor of 15 = probability of number less than 8 + a divisor of 15

= 7/10 + 3/10

= 10/10

= 1

Therefore, the Probability of a number less than 8 OR a divisor of 15 is 1.

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Reason Lena is making a puzzle, she cuts a shape into5. two pieces and rearranges them to make the shape below.Which shape did she start with?6. Draw a picture to show how you can rearrangerthe four triangles cut from a rectangle to makea concave hexagon.

Answers

The answer to 5 is D

What is a terminating decimal?

Answers

Answer:

a terminating decimal is a decimal that ends. meaning it will be like 18.5 ot 17.9 and not like 4.3245.....

Answer:

A decimal that ends.

What is the value of the expression?

(–2)5

Answers

The answer of -10

what is expression?

An expression in math is a sentence with a minimum of two numbers/variables and at least one math operation in it. Let us understand how to write expressions. A number is 6 more than half the other number, and the other number is x. This statement is written as x/2 + 6 in a mathematical expression. Mathematical expressions are used to solve complicated puzzles.

An expression is a combination of terms that are combined by using mathematical operations such as subtraction, addition, multiplication, and division. The terms involved in an expression in math are:

Constant: A constant is a fixed numerical value.
Variable: A variable is a symbol that doesn't have a fixed value.
Term: A term can be a single constant, a single variable, or a combination of a variable and a constant combined with multiplication or division.
Coefficient: A coefficient is a number that is multiplied by a variable in an expression.

Given:

(–2)5

Using integer (-)*(+)= (-)

=-2*5

=-10

Hence, the expression is -10.

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$(-2)5 = (-1 *2)5 = -1(2* 5) = -1(10) = \boxed{-10}$