Can someone help me photo is above

9x + (-1)

Step-by-step explanation:

(7x + 2x) + (2 -3)

9x + (-1)

14x²-17x-6

Step-by-step explanation:

multiply (7x+2)(2x-3)

(1) multiply 7x and 2x =14x²

(2) multiply 7x and -3 = -21x

(3) multiply 2 and 2x= 4x

(4) multiply 2 and -3 = -6

Last step: add all answers from step 1 to 4

: 14x² +(-21x)+4x+(-6)

14x²-17x-6

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.