Which function is equivalent to g(x) = x2+ 15x - 54?

Anyone know? will mark brainliest if correct

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.

Simplify each expression. use positive exponents. show work . (x –2 y –4 x 3 ) –2