Answer:
when
.
Step-by-step explanation:
Given: 
To find: Value of
, substituting the known value of 
We have,

Putting
in equation
, we get


Hence, the value of
is
, when the value of
is
.
to see quick score she must use a pie chart
Answer: 2014
Step-by-step explanation:
LED: -25x + 6y = 20
CFL: 15x + 2y = 322
we need to find which year it was the same to know where LED lighting surpassed CFL lighting
-25x + 6y = 20
15x + 2y = 322 (-3)
-25x + 6y = 20
<u>-45x - 6y = -966 </u>
-70x = -946
x = 13.51
The nearest year would be 14 which is 2014
25.) D
26.) C
27.) B
I hope this helps love! :)