Answer:
A is the answer
12 in
first substitute the variables
then 78=1/2h(5 + 8)
this makes it an equation
add similar terms which equals to
78=1/2xhx13
then divide both sides by 13
6=1/2xh
lastly divide both sides by 1/2
12=h
Step-by-step explanation:
proof
A=1/2x12(5 + 8) then
A=1/2x12x13 then
A=6x13 then
A= 78in^2
645 less than the current population 13,500
13,500 - 645 = 12,855
I hope this helpful to you !
Answer:


Step-by-step explanation:

Substitute
and
back into the equations.


We cannot find
and
as we don't have enough information.
50 miles per hour
264,000 feet in 60 minutes
4,400 feet per minute
73.33... feet per second
73.3 feet per second (rounded to the nearest tenth)!