How many sides are on a triangle?

Three

Step-by-step explanation:

A triangle is a 2-D figure having three sides, three vertices , and three angles formed in it.

The sum of all the three angles in a triangle is 180°

Also, Area of a triangle =

Altitude is the perpendicular height of a triangle from the base of it

Perimeter of a triangle=  Sum of length of all its three sides

In a right angled triangle the Pythagoras Theorem can be applied to find its third side if two are given:    

        (Length of Hypotenuse)²=(Length of Base)²+(Length of Perpendicular)²

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1

really really sorry if i'm

-12 -5(x + 4) = 3x

-12 - 5x - 20 = 3x

-12 - 20 - 5x = 3x

-32 - 5x = 3x

    + 5x   + 5x

-32 = 8x

8         8

- 4= x