Answer each part for the following context-free grammar g. r → xrx | s s → atb | bta t → xtx | x | ε x → a | b a. what are the variables of g? b. what are the terminals of g? c. which is the start variable of g? d. give three strings in l(g). e. give three strings not in l(g). f. true or false: t ⇒ aba. g. true or false: t ∗ ⇒ aba. h. true or false: t ⇒ t.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

c

step-by-step explanation:

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system