5000 = 61400 (.80)^x
5000/61400 = .8^x
log (5000/61400) = x log(.8)
x = log(5000/61400)/log(.8) = 11.24 years
4th root of 256 is 4
4/81 = 0.0493827160493827
Two sides are the same length in an isos triangle so the sides could be
22 22 27 = 71
or 22 24.5 24.5 = 71
50 x 10% = 50 x .1 = 5
Using the Web2.0 calculator
acos(5.8/17) = 70.051432773952 degrees
You need 2 Na atoms to create 1 atom of Na2 SO4 so sodium is the limiting reagent
3.75 moles / 2moles/mole-molecule = 1.875 moles Na2SO4
9^1/2 means sqrt(9) = 3
just divide the fraction
2/5 = 2 divided by 5 = .4
555/1.5 = 370 1:370
b) they are all right triangles they all have AM as one leg
160x = (n-2)180
160x = 180n-360
360 = 20x
x=18 sides
