Answer:
B. x² +9
Step-by-step explanation:
Only B cannot be factored... the rest can be factored as follows
A. x² +9x = x (x+9)
C x² - 9 = x²-3² = (x+3)(x-3)
D 2x² +7x-9 = (2x+9)(x-1)
Given that Antonia and Carla have the same percentage of marbles and Antonia has 4 green marbles out of 16 marbles , to calculate the number of marbles that Carla has that aren't green we proceed as follows;
let the total number of Carla's marbles be x;
the percentage of green marbles that Antonia has is:
4/16×100=25%
since they have the same percentage then:
number of green marbles Carla has is 10:
this is 25% of x, hence:
10/x×100=25
1000/x=25
1000=25x
thus
x=1000/25
x=40
Carla has a total of 40 marbles. Thus the number of marbles which are not green will be:
40-10=30 marbles
Time spent jogging is independent and distance traveled is dependent
Hope it helps :)
