Answer:

Step-by-step explanation:
Tip: When
,
is also true.
| <em>Original equation</em>
| <em>Use tip</em>
Area=pir^2
diameter/2=radius
diameter=9
d/2=9/2=4.5=r
area=pi4.5^2
area=pi20.25
aproxpi=3.14
area=63.585
round hundreth
area=63.59
answer is 63.59cm^2
Answer:
280 years old
Step-by-step explanation:
to determine a dog's age in dog or human years, you divide or multiply by 7
40x7=280 years
Y=mx+b
m=slope
the greater m is the steeper the graph
so the correct answer is B