Step-by-step explanation:

when b = 9, then

Is there a picture???????
Answer:
7x+3
Step-by-step explanation:
Hi there!
Let "a number" equal <em>x</em>.
The product is the answer to a multiplication problem. If we're talking about the product of a number and 7, we're talking about multiplying them:
7x
Now, increasing by 3 just means we need to add 3:
7x+3
I hope this helps!
Answer:
9 seconds.
Step-by-step explanation:
On your graph, use a ruler and your eye to get the best fitting line.
Then find the time in seconds (45) which is between 40 and 50 on the x axis.
Go across to the y axis. You will find it is about 9 seconds.
The diameter is 10 square inches