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It would help to first find the unit rate. We know that the plane flies 810 km per 1.5 hours. Divide by 1.5 on both sides:
810/1.5 = 540 km/hour
Then, multiply both the hour and the distance by 2:
540 * 2 = 1080 km/2 hours.
from left to right
1st triangle is = 24
small rectangle is = 24
larger rectangle is = 96
final triangle is = 12
addition of above values give the area of whole figure which is = 156 units
1/2 because it's 2 times smaller
first
second
and fifth are true
Basically the square root of -1 is i. From that you should be able to deduce the answers.
