F(x) = 2x4 + 6x3- 4x - 1

Step-by-step explanation:

f(x)= 2x4+6x3-4x-1

2 times 4 =8

6 times 3 =18

f(x)=8+18-4x-1

8 plus 18=26

f(x)=26-4x-1

26 minus 1

f(x)=27-4x

f(x)= -6.75

Don't think this rightbut hope that helps

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: