Book Maths Puzzle Percentage

A weather forecaster states that there is a 20% chance of rain on each of the next three days. To the nearest whole percent, what is the probability that it will not rain at all o

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One half the square of a number is equal to 16 more than twice the number. What is the number?

if you could please help that would be great! A long distance telephone campany advertised the following rates:"5 minutes(m)for just $0.85(p) and 10 minutes for just $1.10." Use the ordered pairs(m,p).
a. Find a linear e