Answer:
Nine: 5, 7, 9, 11
Ten: 13, 17, 21, 25
Explanation:
Nine
f(n) = 2n + 3
f(1) = 2*1 + 3 Substitute 1 for n
f(1) = 2 + 3 Multiply 2 * 1
f(1) = 5 Add 3
f(2) = 2n + 3 Substitute 2 for n
f(2) = 2*2 + 3 Combine the factors
f(2) = 4 + 3 Add the terms
f(2) = 7
f(3) = 9 Answer
f(4) = 11 Answer
Ten
f(n) = 4n + 9
f(1) = 4*1 + 9 Substitute 1 for n
f(1) = 4 + 9 Combine the factors
f(1) = 13 Add the terms
f(2) = 4*2 + 9 Substitute 2 for n
f(2) = 8 + 9 The factors (2 and 4) have been combined
f(2) = 17 Add 9
f(3) = 21 Answer
f(4) = 25 Answer