For his phone service, Tom pays a monthly fee of $28, and he pays an additional $0.04 per minute of use. The least he has been c
harged in a month is $84.48. What are the possible numbers of minutes he has used his phone in a month? Use m for the number of minutes, and solve your inequality for m .
Find the area of the cone: Area of cone: ⅓r^2h ⅓r^2h = ⅓(3.5)^2(7) = ⅓(12.25)(7) = 1/3(85.75) = 85.75/3 1/3 cup sloshed out: (85.75/3 )/3 = 29.9 cubic cm
Slot method
20 options
3 slots
First slot: 20 options
Second slot: 19 options (one used up for 1st slot)
Third slot: 18 (one less than last)
Multiply them
20 times 19 times 18=6840
Answer is 6840 ways
