Three more than four times a number is 31

7

Step-by-step explanation:

three more than 4 times the number is 31, so we need to complete the opposite:

The opposite of more (+) is less (-)...

We need to  subract 3 from the total, which gives us 28

And then we need to do the oppostie of 4 times the result which is divided by 4, and we have 28 so we need to do...

28/4      / = divided  = 7

(31-3)/4=7

Hope that helps and good luck :)

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 !