In paralalelipipedul dreptunghic ABCD A'B'C'D' cu AB=4 cm BC=3cm si AA'=5 cm calculati: a. Lungimea diagonalei paralelipipedului b. Lungimea proiectiei muchiei [AB] pe dreapta BD

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.

You need to solve a system of equations. you decide to use the elimination method. which of these is not allowed? 3x - 2y = 7 3x + 4y = 17 equation 1 equation 2

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?