What do the little arrows on the top and bottom lines mean? They are perpendicular.

They are intersecting.

They are parallel.

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

1: 4 if the wew 35 surfboards at the beach how many were short boards?

Which expression is equivalent to (4 +6i)^2? ? -20 + 48i 8 + 12i 16 - 36i 20 + 48i