Or you could do it the mathmatical way:
3x + 2y = 34 (3 eyes for each martian, 2 for each human, is equal to 34)
x + y = 14 (martians and humans combine to 14 people total)
we need to solve for y, ill choose the second equation and get:
y=-x + 14
Now substitue that in for y in the first equation and simplify:
3x + 2(-x + 14) = 34
3x - 2x + 28 = 34
x = 6
Now since X stands for martians, we know we have 6 martians, leaving us with 8 humans.
If you plug those in for the first equation you will find 3(6) + 2(8) = 34, thus there are:
6 Martians (18 eyes) and 8 (16 eyes) Humans.
They both did it by going to 1% first, but you can also just turn 8% into a fraction.
Just put 8/100 (simplified as 2/25) and you will find out that fraction is equal to .08
Multiply .08 by 20 to get 1.6
Or you could simply move the decimal point... 8% is technically 8.0%, and if you want to convert that to a decimal, move the decimal point to spaces to the left, making it .08, and multiply that by 20 to get 1.6.
Other examples of moving the decimal point are 50% is equal to 50.0% move it 2 to the left and you get .5... .5 is equal to 1/2 and half of 20 is 10, so 50% of 20 would be 10.
I'm assuming H is the height, making H perpendicular to BC.
Therefore triangle abh is a right triangle, so by using pythagorean theorem,
To find the area just find the base B + C = 3√7 + 3 and multiply it by your height of 9, and dividing by 2. The answer comes out to be exactly:
So to sum up, your appx area is 49.2176, and your apprx perimeter is 32.4241. If you need it exact, look above for the radicals. (All in feet)