12th grade math. i'm sorta confused. ?

an examination consists of three parts. in part a, a student must answer 2 of 3 questions. in part b, a student must answer 6 of 8 questions and in part c, a student must answer all questions. how many choices of questions does the student have?

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

Collin did the work to see if 10 is a solution to the equation r/4=2.4

Consider the input and output values for f(x) = 2x - 3 and g(x) = 2x + 7. what is a reasonable explanation for different rules with different input values producing the same sequence?