A scientist dropped an object from height of 320 feet. The height of the object is modeled by the equation h=320 - 16t^2 . After how much time will the object hit the ground? v/20 seconds

10 seconds

40 seconds

20 seconds

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?