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1. To complete 18 orbits round around the sun Neptune will go to take 2970 years.

   What is the arithmetic operator?

   Arithmetic operators are four basic mathematical operations in which summation, subtraction, division, and multiplication involve.,

   Summation = addition of two or more numbers or variable

   For example = 2 + 8 + 9

   Subtraction = Minus of any two or more numbers with each other called subtraction.

   For example = 4 – 8

   Division = divide any two numbers or variable called division.

   For example 4/8

   Multiplication = to multiply any two or more numbers or variables called multiplication.

   For example 5 × 7.

   Given that,

   The number of years takes to 1 complete round is 165 years

   1 round  ⇔ 165 years

   Multiply both sides by 18

   18 rounds ⇔ 165 × 18 years

   18 rounds ⇔ 2970 years.

   Hence “To complete 18 orbits round around the sun Neptune will go to take 2970 years”.

   To learn more about the arithmetic operators,

   brainly.com/question/25834626

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