Work out the area of this circle, take n/pi to be 3.142 and give your answer to 2 decimal places.

Step-by-step explanation:

Area of a circle is pi r squared.

So 3.142 times the radius squared.

They gave you the diameter(d), that's the distance all the way across.  You need the radius(r), which is one half of the diameter.  7 divided by 2.

3.142X3.5squared=

Well, 3.5 squared is 3.5X3.5=12.25

So, then 3.142X12.25=38.4895

Now, we round.  Second decimal place is an eight, followed by a nine.  Five or above means round up.

38.49

1.3

step-by-step explanation:

3x2=6   9x+6

bring down the 6 on both sides

6+6=12

12= 9x

divide by 9

12/9 =

1.3 =x