Last week an almanac cost 3.50 this week it is on sale for 2.80 what is the percent decrease?

1. if we have 3 babies what is the probability they’re going to be all boys? 2. if we roll 2 die at the same time what is the probability of getting less than 10 on the first roll and a 5 on the second roll 3. if we have 3 babies what is the probability their is going to be 2 girls? 4. if we have 3 babies what is the probability of having no more than 1 girl? 5. it we have 3 babies and then have another 3 babies what is the probability of us having at least 1 boy and then having all girls?

Use pascal's triangle to find the missing values. x4 - 4xb + 6x2 - ax + 1

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?