I need help!! Given a quadratic function, which choice explains the meaning of the zeros graphically?

a) f(x)= (x+p) (x+q) where p and a correspond to the x-intercepts

b) f(x)= (x-p) (x-q) where p and a correspond to the x-intercepts

c) f(x)= (x-p) (x-q) where p and a correspond to the vertex

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

Rewrite the following quadratic functions in intercept or factored form. show your work. y = x^2 + 7x + 10

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.