Answer: (x+7)(x-7)
how to get answer:
x^2-49 rewrite as
x^2-7^2
use diff of perf squares: a^2-b^2=(a+b)(a-b)
(a=x, b=7)
fill in the formula of the parenthesis
(x+7)(x-7)
to check you answer is correct, you can foil the answer (x+7)(x-7)
A) Be burned to produce oxygeb and energy for cells.
Anaerobic respiration is a process that takes place in the absence of oxygen which, is required to start the other process called, " <span>Aerobic respiration. "</span>
Answer: "the atmosphere" ;
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or, more specifically; the "nitrogen gas from the Earth's atmosphere";
{" N₂ gas in the Earth's atmosphere" } .
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By process of elimination you can find the right answer. We know for a fact that carbon is found in all living organisms. That is why we talk about carbon based life forms. So the first statement cannot be true. You can figure out how many Valence electrons an element has by looking at the group number. The group number of carbon is 4 so the 2nd statement cannot be true. We know that carbon does bond with other elements because it is not a noble gas and therefore must be able to form compounds.
This means the answer must be they can form up to four covalent bonds
Answer:
The reactivity of acetic acid with various chemicals.
