Can someone help me with this please

Which expression is equivalent to the expression shown?

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation