Answer: 1 or -7/5
Step-by-step explanation:
5x2+2x-7=0
Factorise
Factors of -35 that will give +2 is +7&-5
5x2+7x-5x-7=0
X(5x+7)-1(5x+7)=0
(X-1)(5x+7)=0
X-1=0
X=1
5x+7=0
5x= -7
X= -7/5
X= 1 or-7/5
Answer: division properties
Step-by-step explanation:
<h2>ANSWER : </h2>
<h2>» 14n-6/3 </h2>
refer to the above attachment ↑
We know that
<span>Joey and Rita paint a room in 8 hours
so
100%----------> 8 hours
X%----------> 1 hour
x=100/8-----> 12.5%
that means
</span>Joey and Rita paint 12.5% of a room in 1 hour
Billy paint a room in 12 hours
so
100%----------> 12 hours
X %------------> 1 hour
x=100/12----> x=8.33 %
that means
Billy paint 8.33% of a room in 1 hour
i<span>f all three work together
then
All three paint (12.5%+8.33%) in 1 hour
20.83%------------> 1 hour
100%------------> x
x=100/20.83-----> x=4.8 hours
the answer is
4.8 hours</span>