Jess has dinner at a restaurant. the dinner bill is b dollars. she pays a 21% tip. match the expressions to their correct meanings for jess. here are the possible answers  jess's bill amount without tip: jess's tip amount: jess's total amount:   b+0.21; b; 2.1b; b/0.21b; 0.21bnot all the answers will be used i need right away.

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.

Which of the following represents the zeros of f(x) = 6x3 − 31x2 + 4x + 5? −5, one third , one half 5, − one third , one half 5, one third , − one half 5, one third , one half

What is sin 7x/4 ? i need on this urgent trig