math
posted by Joey .
If you usually burn after 1/2 hour expose to sun, you can lenghten the time you are in the sun to three hours by applying SPF number 6. how long could a person who burns after 1/4 hour stay in the sun using SPF 15 lotion?
Respond to this Question
Similar Questions

math (rate)
I need help! Ok here's the problem. Melissa lights 2 candles that are the exact same height at the exact same time. The blue candle takes 6 hours to burn completely. The purple candle takes 9 hours to burn completely. After how many … 
physicssun
a 1 square meter solar panel receives a total of 1000Watts from the sun. If we assume all the energy is release through nuclear fusion from the sun what is the total output from the sun? 
math grade 12
It is a beautiful sunny day at Canada’s Wonderland. The U.V. index for this day is 8, or high, so sunscreen is a must for all people. The effectiveness of sunscreen is indicated by the sunscreen protection factor (SPF). The higher … 
physics
You are lying on the beach on a tropical island on the equator, watching the Sun set  what a beautiful scene! Immediately after the top of the Sun disappears, you stand up to watch the Sun set again. After the amount of time t=10 … 
Math
alex estimates that if he lies in the sun for k hours it will take him (10+10k) to get to sleep at night because of the sunburn . If Alex wants to get as much sun as possible without taking more than half an hour to get to sleep, how … 
Calculus
s(t) = t^2  6t + 5 models the motion of a person cycling along Rte 66 where s(t) is the number of miles north of Los Angeles the person is at time t hours. 1) Write functions for the cyclist's velocity and acceleration at any time … 
Calculus
s(t) = t^2  6t + 5 models the motion of a person cycling along Rte 66 where s(t) is the number of miles north of Los Angeles the person is at time t hours. 1) Write functions for the cyclist's velocity and acceleration at any time … 
English
Thank you for your help. There are some more sentences concerning the preposition 'in.' 1. He will be back in a few days. 2. The show starts in an hour. 3. Do you wnat to meet here in an hour? 
math
A parking lot charges a flat rate of x dollars for any amount of time up to two hours, and x 6 1 for each hour or fraction of an hour after the first two hours. How much does it cost to park for 5 hours and 15 minutes? 
Math
A car travels for three hours at 80km/hour. After three hours, it turns right. It drives 60km/hour for three hours. How many km has it traveled?