(3n-9)+(1/5n+13)=(?+1/5n)+(-9+?)=?< br />
Can u halp :C you need to simplify answer

+ 4

Step-by-step explanation:

First Step: Write the equation

(3n - 9) + (n + 13) =

Second Step: Combine like terms together

(3n + n) + (-9 + 13)=

Third Step: Simplify

+ 4

Hope this helped! <3

the diameter is 16 cm. are you a teacher?

step-by-step explanation:

18 units²

step-by-step explanation:

first let's find altitude bd using the distance formula

d = √((y₂ - y₁)² + (x₂ - x₁)²)

bd = √((0 - -3)² + (0 - 3)²)

bd = √18

given the placement of points a and c, we can denote that point d bisects segment ac.

we will call ac the base.

using the distance formula

ac = √((0 - 6)² + (-6 - 0)²)

ac = √72

knowing our base and our height, we can plug these into our triangle area formula

area = (b * h)/2

area = (√18 * √72) / 2

area = (√1296) / 2

area = 36 / 2

area = 18 units²