Which expression is equivalent to 0?
(a)(-a)
a +(-a)
a/-a
a - (-a)

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost

Pls brainliest will be awarded if answer is correct