Im super confused pls help

Average salary for a medical assistant is $31,220 which is a 20% income tax bracket how much money would they pay in income tax?

What is the standard form of -5x^2+2x^4-11+x^3+3x

Assume that 1400 births are randomly selected and 1378 of the births are girls. use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high. choose the correct answer below. a. the number of girls is neither significantly low nor significantly high. b. the number of girls is significantly high. c. the number of girls is significantly low. d. it is impossible to make a judgment with the given information.