The Sanchez family recently dined at an Italian restaurant. Each of the four family members ordered a pasta dish (p) that cost $11.50, a drink (c) that cost $1.50, and dessert
(d) that cost $275.a. Write an expression that could be used to calculate the cost of the
Ross' dinner before adding tax and a tip.

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.

Can some one explain this i got sent this. is this a threat i’m scared

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis. y = 7ex, y = 7e^-x, x = 1; about the y-axis