The surface area of a right cone which has a base diameter of six units and a height of eight units is:

Step-by-step explanation:

The surface  area of right cone is calculated by the following formula

Where r is the radius of the cone and h is the height

In this case we know that the diameter d of the base is:

So the radius is:

and

So the area is:

Step-by-step explanation:

The surface area of a right cone is given by

The relation between the slant height l, the radius r, and the height h, is

x > 1.3

step by step:

8.5−0.9x> 9.8−1.9x

step 1: simplify both sides of the inequality.

−0.9x+8.5> −1.9x+9.8

step 2: add 1.9x to both sides.

−0.9x+8.5+1.9x> −1.9x+9.8+1.9x

1x+8.5> 9.8

step 3: subtract 8.5 from both sides.

1x+8.5−8.5> 9.8−8.5

1x> 1.3

step 4: divide both sides by 1.

1x/1 > 1.3/1