How do i solve this?

Step-by-step explanation:

Let's simplify step-by-step.

7n^4+4+4n^2+3n^2+3−2n^4

=7n^4+4+4n^2+3n^2+3+−2n^4

Combine Like Terms:

=7n^4+4+4n^2+3n^2+3+−2n^4

=(7n^4+−2n^4)+(4n^2+3n^2)+(4+3)

=5n^4+7n^2+7

=5n^4+7n^2+7

Hope this helps :)

1: 3 ratio of the volume of the cone to the volume of the cylinder

Step-by-step explanation:

Volume of cone(V) is given by:

where, r is the radius and h is the height of the cone.

Volume of cylinder(V') is given by:

where,  r' is the radius and h' is the height of the cylinder.

As per the statement:

A cylinder and a cone have congruent heights and radii.

⇒r = r' and h = h'

then;

⇒

Therefore, the ratio of the volume of the cone to the volume of the cylinder is, 1 : 3