Answer:
d. -3a3 – 3a² + a +8
Step-by-step explanation:
Simplify the expression.
An integer is a number that comprises of natural numbers like 0,1,2,3,4... so on and negative whole numbers like -1,-2,-3 and so on.
Multiplication Rules:
1. Product of two positive integers is always POSITIVE.
Eg: 
2. Product of two negative integers is always POSITIVE.
Eg: 
3. Product of a negative integer and a positive integer is always NEGATIVE.
Eg: 
Quotient Rules:
1. Positive integer divided by a positive integer is always POSITIVE.
Eg: 
2. Positive integer divided by negative integer or negative integer divided by a positive integer is always NEGATIVE.
Eg: 
3. Negative integer divided by a negative integer is always POSITIVE.
Eg: 
Answer:
Equation: 6+d-18
d = difference of a number and eighteen
Idk if it helps. :|
<h3>
Correct Question :</h3>
Express in arithmetic :
Seven added to double a number.
<h3>
Solution :</h3>
Let the unknown be x.
Then, double of the number = 2x.
Atq,
2x+7
Hence,seven added to double a number = 2x+7