Question

The sum of 5.5 and twice a number is -10

What is the number?

n = 7.75

n=2.125

n= -7.75

n=-2.125

Answer 1

n=-7.75

Explanation:

Based on the given conditions, formulate: 5.5+2×X=-10

Rearrange unknown terms to the left side of the equation:2x=-10-5.5

Calculate the sum or difference:2x=-15.5

Divide both sides of the equation by the coefficient of variable:x=-15.5/2

Multiply both the numerator and denominator with the same integer:-155/20

Cross out the common factor:-31/4

get the result: -7.75

Answer: -7.75

Answer 2

The answer is n= 7.75.