The meaning of the phrase cost-effective in the first paragraph of this passage is C. getting the most for the money you spend.
If you insulate and seal air leaks in your home on time, you won't have to think about that in the future. Thus, if you pay a lot of money now, you will save a lot more in the future than if you didn't insulate, and then had to fix stuff around the house all the time, which would waste so much of your money.
Definition of Implicit: implied though not plainly expressed
Definition of Bias: prejudice in favor of or against one thing, person, or group compared with another, usually in a way considered to be unfair
(So just put the two together)
Photocopy
Photocopier
Telephoto
Photosynthesis
Photocell
<span>The type of language which student should use when speaking to teachers in class is formal language. This is because school is a formal and academic enviroment, the kind of language and tone use in this type of enviroment is formal language. Informal and casual language are used in informal settings.</span>
