$1)$ A beachball is tossed from the top of a swimming pool sliding board. The formula

h $=4\mathrm{.}9$t$2+8\mathrm{.}7$t $+5\mathrm{.}975$

can be used to determine the height h in meters of the beachball at time t in seconds after it is released. When will the beachball hit the pool water $($in seconds$)?$ Round to the nearest tenth. $2)$A jazz group on tour has been drawing average crowds of $700$ people. It is projected that for every $$1$ increase in the $$11$ ticket price, the average attendance will decrease by $70.$ At what ticket price will nightly receipts be $$6,860?$