In the figure, ABCD is a trapezoid with legs AB and CD.
Join AC and BD.
For the triangle CAD, from the vertex C, draw an altitude CE and for the triangle ABD, from the vertex B, draw an altitude BF.
Clearly, CE = BF = h (say) --- (1)
Note that the base of the triangles CAD and ABD are the same and is AD.
It is given that ar(CAD) = 
.
Now, ar(ABD) = 
= 
from (1)
= ar(CAD)
= .
Hence, area of Δ ABD = ..
Ok so for #18 8(x+5)-4(x+4)
you take 8X1x and 8x5
Answer: 8
Explanation: 20u-20u cancel out leaving 8
Answer: Town 1
Step-by-step explanation:
Town 1's population is growing at a factor of 1.02 which means that it is increasing by 2% a year.
Town 2 is growing at a factor of 0.999 which means that it is decreasing at a rate of:
= 1 - 0.999
= 0.1%
Town 3's population is increasing by 150 a year and town 4 is 200 people a year.
Town 1 will eclipse them all eventually because it is <u>growing proportionally at 2%</u>.
Towns 3 and 4 will eventually see 150 and 200 people fall below 2% of their town's population which means they will be growing at a slower rate than Town 1.
