-3x(-7) = -3(-2)(-7) ⇒ -42
-42 would be the answer.
Excluded values are -3, 0 and 8, so denominator will be:
Answer A.
90. For the first position,you can have one of 10 ppl in president/vice president. Then the remaining 9 ppl can be put in the remaining position. 10 * 9 = 90. If you need more explantion check these keywords. Factorial, permutations, combinations.
Answer:
f(x) = 2/x and g(x) = 2/x
f(g(x)) = f(2/x) = 2/(2/x) = x
g(f(x)) = g(2/x) = 2/(2/x) = x
