Brittney wants to simulate a random selection from a large population of 30% science teachers and 70% English teachers who attended a conference. Which TWO simulations are appropriate for this situation? A) Use a coin. Designate heads for science teachers and tails for English teacher.

B) Use a spinner with 7 equal sections.

C) Cut 10 slips of paper, equal in size. Use 3 slips for science teachers and 7 slips for English teachers and randomly select from the 10 slips of paper.

D) Cut 12 slips of paper, equal in size. Use 6 slips of paper for science teachers and 6 slips of paper for English teachers and randomly select from the 12 slips of paper.

E) Use a spinner with 10 equal sections. Three of the sections are red, and 7 of the sections are blue.

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1

answer: the answer is e

step-by-step explanation: