What is the coefficient of the variable in the simplified expression 3s + 15 ?

3

Step-by-step explanation:

The coefficient of the variable is the number in front of the variable

3s+15

The number in front of the variable is 3

Simplifying

5(6.2a + 9.8) = 18

Reorder the terms:

5(9.8 + 6.2a) = 18

(9.8 * 5 + 6.2a * 5) = 18

(49 + 31a) = 18

Solving

49 + 31a = 18

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-49' to each side of the equation.

49 + -49 + 31a = 18 + -49

Combine like terms: 49 + -49 = 0

0 + 31a = 18 + -49

31a = 18 + -49

Combine like terms: 18 + -49 = -31

31a = -31

Divide each side by '31'.

a = -1

Simplifying

a = -1