Which of the following functions represents a cell phone bill if there is a monthly charge of 20 dollars plus 6 cents for each minute of use? f(x) = 20 + 6x f(x) = 20.06x f(x) = 20 + 0.06x

Option 3rd is correct

Step-by-step explanation:

Let x be the time in minutes and f(x) be the cell phone monthly bill.

Given the statement:

if there is a monthly charge of 20 dollars plus 6 cents for each minute of use

Use conversion:

1 cent = 0.01 dollars

6 cents = 0.06 dollars

" means 0.06 x

then;

the function represents a cell phone monthly bill is given as:

x ≥ 18 is your answer

step-by-step explanation:

let "a number" = x

(2/3)x + 17 ≥ 29

isolate the variable (x). do the opposite of pemdas (parenthesis, exponent (& root), multiplication, division, addition, subtraction).

first, subtract 17 from both sides.

(2/3)x + 17 (-17) ≥ 29 (-17)

(2/3)x ≥ 29 - 17

(2/3)x ≥ 12

next, multiply 3/2 to both sides to isolate the x

(3/2)(2/3)x ≥ 12(3/2)

x ≥ 12(3/2)

simplify. multiply, then divide

x ≥ (12 * 3)/2

x ≥ (36)/2

x ≥ 18

x ≥ 18 is your answer

~