(n+2)^4 =
(n²+4n+4)(n²+4n+4) =
n^4 + 4n³ + 4n² + 4n³ + 16n² + 16n + 4n² + 16n + 16 =
n^4 + 4n³+24n²+ 4n + 16
Hope this helps
All real numbers............
Answer: 15 tests per hour.
Step-by-step explanation: Mrs. Wilbur did 30 tests in 2 hours, so you would divide to find the rate per hour. 15 should be your answer.