$18 = 14 + 0.20(t)
- 14
4 = 0.20t
Divide 4 by 0.20
t = 20
0.20 * 20 = 4
4 + 14 = 18
Because it only charged her for texts after 450, its 450 + 20.
470. She sent 470 texts that month.
To find the lateral surface area, use the following formula
la = π × r × s
Given:
π = 3.14
r = 7 ft
s = 13 ft
Solution
Input the numbers to the formula
la = π × r × s
la = 3.14 × 7 × 13
la = 285.74
The lateral surface area of the cone is 285.74 square feet
volume of the glass:
PI x r^2 x h = 3.14 x 3^2 x 12 = 339.12 cubic cm
150 / 339.12 = 0.442 = 44.2%
Round the answer as needed.
