Answer:
c is the answer for number 6 and
Step-by-step explanation:
and b is the answer for number 7
I just did this question: Distance around a circle,C=nd,C=nr-in circumference of a circle
Area of a circle:A=nr,Measured in square units,(radius)(1/2 circumference)
Answer:
36 miles.
Step-by-step explanation:
We have been given that Karina rode her bike up a mountain trail at an average of 4 mph. Then she rode it back down the trail at an average of 20 mph. The entire trip took 3 hours.

Substitute the given values:




The total distance is 72 miles, so the distance going up would be half of 72.

Therefore, Karina went 36 miles up the mountain.
6.40=4n
6.4/4 = 4n/4
n=$1.60
n= notebook
p=price in $
Final Answer: $1.60 per notebook