Can someone pls help me with this i need a answer and i need to explain pls help!

A. 20%

Step-by-step explanation:

If the total amount of grams is 150 grams then we can represent this as a fraction. Using our total grams as denominator and our numerator as the amount of cheese grams. So we can use 30/150 which equals 1/5 which also equals 0.2=20%

OPTION A

PERCENTAGE OF CHEESE IN SANDWICH=TOTAL GRAM CHEESE/TOTAL WEIGHT OF SANWICH ×100

=30/150×100

=1/5×100

=20%

  y= -3x is the required function.

step-by-step explanation:

we have been given a table:

x             y

0             0

1             -3

3             -9

-2             6

we can see that the values of y is -3 times the value of x

hence, the function would be: y= -3x.

put the values of x will give the same y as in the table that means function is satisfying the given table.

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.