B. they are directly proportional because she keeps taking 3 at a time to his 1 at a time.
Since you get 10% off, you only pay 90% of the price.
1200 x 0.90 = 1080
Therefore the price is $1080 before taxes.
You have to separate the 2 and p so divide 60 by 2 which will leave p=30 and now if you plug it in you see 2 times 30 equals 60 :)
Area = 1/2(Base * Height)
Area = 1/2(6*20) = 60m^2
the area of the triangle is 60m^2
Triangle is attached below
The triangle is 12 by 10 by 8
Perimeter:
To find perimeter we add all the sides of the triangle
Perimeter P = 12 + 10 + 8 = 30 units
Semi perimeter:
Semi perimeter is half of its perimeter
We know P = 30
Semi perimeter s=
=
= 15 units
Area:
If we know the sides of the triangle then we use Heron's formula to find the area of the triangle

Where s= semi perimeter
a,b,c are the sides of the triangle
s= 15 units
a= 12 units
b= 10 units
c= 8 units




A= 39.7 square units