Answer:
551/1
Step-by-step explanation:

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Any integer can be written as a rational number with a denominator of 1.
Answer:C 5a^2 +70a +240
Step-by-step explanation:
Honestly I don’t even know what this is sorry I tried
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If we were to foil
after experieence
we know
ax²+bx+c=0
and
in form
(ax+b)(cx+d)=0
if we expand it, we get
acx²+bcx+adx+bd=0
or
(ac)x²+(bc+ad)x+(bd)=0
compare to
ax²+bx+c=0
we notice that the middle terms (x terms) are
b=(bc+ad)
so
in form
(2x-1)(1x+5)
b=bc+ad=(-1*1+2*5)=-1+10=9
b=9
or you could just expand it