In a Math 3 class, the red group has four members. Brian can solve an equation in 5 minutes, Luis can solve one in 4 minutes, and Sylvia can solve one in 6 minutes. How long will it take the group to complete a 10 problem worksheet if they work together? Round your answer to the nearest tenth of a minute. PLEASE HELP M

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Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min if they did not stop driving, how many miles could kyle and elijah drive in a whole day? ? 1 day = 24 hours. plzzz i will give you 100 points

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)