Of the 210 boys in the 8th grade, 190 have a cell phone. of the 168 girls in the 8th grade, 152 have a cell phone.

8th grade class cell phones total
boys 190 210
girls 152 168
determine if the relationship is proportional.

a.
proportional

b.
not proportional

A. The relationship is proportional

Step-by-step explanation:

The ratio of boys who have phones is 19:21 and the ratio of girls who have phones is 19:21 because is equal to

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