Ascuba diver started at sea level is descending at 4.2 ft every 1/3 of an hour. how far below sea level is he after 1 hour and 20 min? ?
4) jayda is running around a track where 3 laps is 5 km. she runs 6 laps in 20 min. what is her speed in min per plzz i will give you 100 pointd

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

20 points plus brainliest andwer plus my hover hoard im v desperate ! evaluate the polynomial for x=-2 in the equation -3x^3+7x^2-7x-1 (simplify your answer)