Um we need to see the diagram in order to answer this question sorry...but have a good day :)
Answer:
$840
Step-by-step explanation:
First, add 30 to 10.
Then, multiply your answer (40) by 21.
Finally, you get your final answer of $840.
Answer:


Step-by-step explanation:
Given
A circular ring
Required
The length
Let
the radius of the ring
The length is calculated by calculating the circumference of the ring.
This is calculated using:

or

Where
diameter
and 
Answer:
2+2= 4 and 2÷2= 1
Step-by-step explanation:
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