Jorge wants to know whether music affects plant growth. he puts two identical plants in separate rooms. one room is sunny and has a stereo
playing rock music all day. the other room is quiet and dark. he gives both plants the same amount of water. after two weeks he compares
the plants. the plant in the room with music is green and growing. leaves on the plant in the other room are turning yellow. he concludes
that music plants grow.
what makes his scientific explanation weak?
a he did not have a testable hypothesis.
8. he did not use two different plants in each room.
c. he did not add fertilizer to the plants in either room.
d. he had more than one variable in his experimental conditions

D) because with the plant with music he put the plant in a room with light and very sunny, but the plant with no music was put in a dark room with no light. He needed to have put both plants in a room with light but one plant has music and one doesn't.

(x3 + 6x2 + 2x - 6) • (x - 1)

step-by-step explanation:

polynomial long division :

3.2     polynomial long division

dividing :   x4+5x3-4x2-8x+6

                              ("dividend")

by         :     x-1     ("divisor")

dividend     x4   +   5x3   -   4x2   -   8x   +   6

- divisor   * x3     x4   -   x3            

remainder         6x3   -   4x2   -   8x   +   6

- divisor   * 6x2         6x3   -   6x2        

remainder             2x2   -   8x   +   6

- divisor   * 2x1             2x2   -   2x    

remainder               -   6x   +   6

- divisor   * -6x0               -   6x   +   6

remainder                     0

quotient :   x3+6x2+2x-6   remainder:   0

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18