A man can swim in still water with a velocity of 4 m/s . He crosses a river directly perpendicular to the river when he heads 30° with the normalto the riverbank. calculate the velocity of river

Which of the following could use reverse transcriptase to transcribe its genome? a) ssrnab) dsrnac) ssdnad) dsdna

First to answer will be the brainliest i need the answer asap

Which is one way that sinkholes can form? a) tornadoes touch down and destroy trees and brush b) rivera overflow during a storm and wash away nearby land c) rainwater flows away from a depression in the ground d) groundwater dissolves the limestone and other rocks in the ground