R/ r+ 15 = 3/8
Cross multiply: top of one side multiplied by bottom of other side:
R x 8 = 3 x r+ 15
Simplify:
8r = 3r + 45
Subtract 3r from both sides:
5r = 45
Divide both sides by 5:
R = 9
Answer:
16 hours
Step-by-step explanation:
let t be time, n the number of computers and w the number of workers, then
t = 
← k is the constant of variation
To find k use the condition n = 30, w = 6 and t = 10 , then
10 = 
( multiply both sides by 6 )
60 = 30k ( divide both sides by 30 )
2 = k
t = 
← equation of variation
When w = 5 and n = 40 , then
t = 
= 
= 16 hours
Answer:
0.0365 pounds per dollar
$2.79 per pound
$2.79 per pound is typically used
Step-by-step explanation:
13.95/5 = $2.79 per pound
5/13.95 = 0.0365 pounds per dollar
-5.9, -4.6, -1/4, 1/2, 1.75, 2, 18, 21.
