By using a tens number as you refer to a multiple of ten. As a multiple of ten you can just add it to another number easier than a ones number
Find the rate of change at x=0 and at x=3, then find the average of those values.
f(0) = 2(0) + 1 = 1
f(3) - 2(3) + 1 = 7

Answer: 4
141.3 is the answer
hope it helps you
45×3.14(pie)=141.3
2 chocolate chip: 3 sugar So, this is the ratio.
The sum of this is 5 but we need it to be 20, because there are 20 cookies.
Let's try multiplying 4 to each side:
4 * 2 chocolate chip : 4 * 3 sugar
8 chocolate chip: 12 sugar
8 + 12 = 20
So, you have 12 sugar cookies.
Final Answer: 12 sugar cookies