to get the equation of any straight line, we simply need two points off of it, let's use those two points from the table in the picture below.
Answer:
$973.77
Step-by-step explanation:
$927.40 = 100%
New price = 100% + 5%
New price = 105% of 927.40
105% of 927.40 = 1.05(927.40)
1.05(927.40) = 973.77
-Chetan K
So first we write out their respective charges
A=65+30x (x=hours of A)
B=30+47.5y (x= hours of B)
we want to know when A and B are equal so just set them to be equal
65+30x=30+47.5x
subtract 30 from both sides
35+30x=47.5x
multiplyboth sides by 2 to get rid of the nasty decimal
70+60x=95x
subtract 60x from both sides
70=35x
divide both sides by 35
2=x
they must work 2 hours for them to be equal
D. 5x+5y=10
The other 3 could be simplified further and have no y value.
Hope that helps
We want the concentration of the antibiotic to be at a minimum of 5 mg/dL, so we want to find the time interval, where 
, for which 
.
We have
Completing the square, we get
