WILL GIVE BRAINLIEST PLS HELP 4. Identify the vertex, focus, and directrix.

Y=1/12x^2

O vertex (0, 0); focus (3, 0); directrix åt y = 3
O vertex (0, 0); focus (3, 0); directrix at y = -3
O vertex (0, 0); focus (0, 3); directrix at y = 3
O vertex (0, 0); focus (0,3); directrix at y = -3

Which fraction is not equivalent to 8/12 a. 2/3 b. 24/36 c. 4/10 d. 6/10

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.