Each fifth-grade student in a school district attends one of three elementary schools: A, B, or School A has 100 fifth-graders, school B has 200 fifth-graders, and school has 300 fifth-graders. A school administrator wants to randomly select 60 fifth-grade students to participate in a new program designed to improve reading comprehension. The administrator will select 10 students from school A, 20 students from school B, and 30 students from school so that each fifth-grade student in the district has the same chance of being selected for the program. (a) is the sample an SRS of all fifth-grade students in the district? Explain.
(b) Explain clearly how you would use your calculator to select a sample of 10 fifth-grade students from school A.
(c) A portion of a random number table is shown below. Beginning at line 140, select the first three fifth graders from school A. Explain your procedures clearly
140 12975 13258 13048 45144 72321 81940 00360 0242
141 96767 35964 23822 96012 94591 65194 50842 53372
142 72829 50232 97892 69408 77919 44575 24970 04178

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you

i think it might be a but you might want a second opinion

2*2=3

two times two is four

i dont understand what you mean so pls comment

a

step-by-step explanation:

given the 2 equations

- x + y = - 2 → (1)

2x - 3y = 4 → (2)

multiplying (1) by 2 and adding to (2) will eliminate the x- term

- 2x + 2y = - 4 → (3)

add (2) and (3) term by term

(2x - 2x) + (- 3y + 2y) = (4 - 4), simplifying gives

- y = 0 ⇒ y = 0

substitute y = 0 in either of the 2 equations for corresponding value of x

substituting in (2) gives

2x = 4 ( divide both sides by 2 )

x = 2

solution is (2, 0 ) → a