Answer:
3.125 kilometers
Step-by-step explanation:
Answer:
26 minutes on the bicycle
Step-by-step explanation:
Let t and b represent the number of minutes on the treadmill and bicycle, respectively. The problem statement tells us two ways to relate these values.
t + b = 60 . . . . . Amy exercises a total of 60 minutes (1 hour)
9t +6.5b = 475 . . . . . she burns a total of 475 calories
Since we want to find the value of "b", we can use the first equation to write an expression that will substitute for t.
t = 60 -b
9(60 -b) +6.5b = 475
540 -2.5b = 475 . . . . . . simpify
-2.5b = -65 . . . . . . . . . . subtract 540
b = 26 . . . . . . . . . . . . . . . divide by -2.5 (equivalently, multiply by -2/5)
Amy spends 26 minutes exercising on the bicycle.
Answer:
3b²(4b²+1)
Step-by-step explanation:
You can factor out a 3b²
3b²(4b²+1)
Multiply through the second term by 
:
Recall that 
for all x :
If 
, we can cancel a factor of it in the second fraction.
and this simplifies to
