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Effectus [21]
3 years ago
12

1. What types of numbers make up the set of rational numbers?

Mathematics
1 answer:
Ad libitum [116K]3 years ago
8 0

Answer:

Natural Numbers, Whole Numbers, and Integers are rational numbers.

Example: {1, 2, 3, -1, -2, -3}

Numbers with repeating decimals and terminating decimals are also rational.

Example: {2.34343434..., 3.45}

If a square root makes a perfect square, then it is rational.

Example: {√16, √100}

Hope this helps.

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If a cubic foot of stone weighs 150 lb and a cubic foot of iron weighs 480 lb, what fraction of the second weight is the first o
iris [78.8K]

Answer:

72,000

Step-by-step explanation:

8 0
3 years ago
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Twice a number (z) added to 21 is equal to 9 times the number added to 7. What is the number?
pickupchik [31]

Answer:

The number is  2

Step-by-step explanation:

Twice a number (z) = 2*z = 2z

Twice a number (z) added to 21  = 2z + 21

9 times the number added to 7 = 9z + 7

9z + 7 = 2z + 21

Subtract 2z form both sides

9z - 2z + 7 = 21

       7z + 7 = 21

Subtract 7 from both sides

7z = 21 - 7

 7z = 14

Divide both sides by 7

z = 14/7

z = 2

5 0
2 years ago
Seven more than twice a number is equal to 25. Which of the following is the number? Use
Snowcat [4.5K]

Answer:

the answer is 9

Step-by-step explanation:

when doubled 9 is 18

18+7=25

4 0
2 years ago
Read 2 more answers
Tabitha's mom is trying to decide between two plumber companies to fix her sink.
ohaa [14]

Answer:

the amount due for 3 hours would be $52 + ($34/hr)(3 hrs) = $154

Step-by-step explanation:

Write two equations, one for the total cost payable to Water R Us and another to Clogs:  

$52 + ($34/hr)t  =  $34 + ($40/hr)t, or

$18 = ($6/hr)t, which tells us that t = 3 (That's 3 hours).

At the time the charges from the two companies would be the same (3 hours into the job), the amount due for 3 hours would be

$52 + ($34/hr)(3 hrs) = $154

5 0
3 years ago
List at least two conductors and two insulators you use or see being used every day. How do they work?
Mrrafil [7]

Answer:

a conductor: copper and any metal

insulator: rubber and wood

Step-by-step explanation:

We use the insulators to safely touch wire.

We use conductors to help us power things like cars and tv's.

Conductors work by letting electricity freely flow through it.

Insulators the opposite

Hope this helps buddy

3 0
2 years ago
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