What’s the answer?

21.98

Step-by-step explanation:

Circumference is 2 x pi x r

2 x r is diameter so we can just do 7 x pi

pi is 3.14 so 7 x 3.14

21.98

step-by-step explanation:

in the absence of parentheses, i will have to make some assumptions:   i interpret your (3x+5/y^6)(4y^3/5)​ to mean:

3x + 5     4y^(3/5)       (3x + 5)(4)

* =

    y^6             1               y^(6-3/5)

if this is not what you expected, repost your question using parentheses to indicate whether you meant

4y^3

    or   4y^(3/5)

    5

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8