For what value of k will make the three points (1,4),(-3,16)and(k,-2)collinear?

k = 3

Step-by-step explanation:

Collinear means the points lie on the same line , thus the slope between consecutive points is equal.

Calculate the slope m using the slope formula

m =

with (x₁, y₁ ) = (1, 4 ) and (x₂, y₂ ) = (- 3, 16 )

m = = = - 3

Repeat with the point including k and equate to - 3

(x₁, y₁ ) = (- 3, 16 ) and (x₂, y₂ ) = (k, - 2 )

m = = = - 3 ( multiply both sides by k + 3 )

- 18 = - 3(k + 3) ← divide both sides by - 3

6 = k + 3 ( subtract 3 from both sides )

3 = k

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

hope this !