40% of 30 is what number

12

Step-by-step explanation:

This is a simple solution, you simply need to multiply 30 by 40%

1. 30 * .4 = 12

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.