Hello,
Answer B
if 3k+3<0 ==>|3k+3|=-3k-3
==>-3k-3>12
==>-3k>15
==>k<-5
if 3k+3>0 then |3k+3|=3k+3
3k+3>12
==>3k>9
==>k>3
Answer:
X = 9/2 or X = 3
Step-by-step explanation:
5x + 2 = 7x -7
5x - 7x = - 2 - 7
<u>2</u><u>x</u> =<u> </u><u>-</u><u>9</u>
2 2
X = - 9/2
or X = 3 (lowest term)
Answer:
24.5 points
8 points
Step-by-step explanation:
khan academy
Answer:
200(50) is for the original revenue, and (200 - 10(50 + 5)) is if they increase it once.
Let x be volume of 5% acid and y be volume of the 8%
x + y = 750 and
0.05x + 0.08y = 0.07*750 = 52.5
from first equation y = 750 - x so substituting in the second equation:-
0.05x + 0.08(750 - x) = 52.5
0.05 - 0.08x = 52.5 - 60
-0.03x = -7.5
x = -7.5 / -0.3 = 250 mls <------ answer