I need help but quick tho

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Amanufacturer knows that their items have a normally distributed lifespan, with a mean if 9.1 years, and standard deviation of 2.9 years. if you randomly purchase one item, what is the probability it will last longer than 10 years?

The tax rate on harriet walker's 80,000 vacation home is 20 mills. the property is assessed at full value. how much will harriet walker's pay in taxes this year