Answer:
n²-7n-21
Explanation:
Given the expression:

First, open the brackets:

Next, bring the like terms together and simplify:

The fractions less than 1/2 are:
A. 1/3
C. 2/5
-- False. Gamma rays have the shortest wavelengths
on the electromagnetic spectrum.
-- A disturbance that transfers energy from place to place
is called a wave.