Can someone me, this is my last question i have been stuck on it for 30 min

the work of a student to solve a set of equations is shown:

equation a: y = 15 − 2z
equation b: 2y = 3 − 4z

step 1: −2(y) = −2(15 − 2z) [equation a is multiplied by −2.]
2y = 3 − 4z [equation b]
step 2: −2y = 15 − 2z [equation a in step 1 is simplified.]
2y = 3 − 4z [equation b]
step 3: 0 = 18 − 6z [equations in step 2 are added.]
step 4: 6z = 18
step 5: z = 3

in which step did the student first make an error?
step1
step 2
step 3
step 4

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

Drag the tiles to the boxes to form correct pairs. not all tiles will be used with reference to the figure, match the angles and arcs to their measures. *dpa 124 e0b 114° cob spot xoca 122° c e 2019 orentum arts reserved a 6: 52 pm 6/19/2019 40

In 2000, for a certain region, 27.1% of incoming college freshman characterized their political views as liberal, 23.1% as moderate, and 49.8% as conservative. for this year, a random sample of 400 incoming college freshman yielded the frequency distribution for political views shown below. a. determine the mode of the data. b. decide whether it would be appropriate to use either the mean or the median as a measure of center. explain your answer. political view frequency liberal 118 moderate 98 conservative 184 a. choose the correct answer below. select all that apply. a. the mode is moderate. b. the mode is liberal. c. the mode is conservative. d. there is no mode.