Yesssssss !
40% + 35 % = 80 % so 20% are dated after 1980
20% is .20 in decimal form
.20 (1600) = 320 coins dated after 1980
j = 7d given
let 's' = papers taken from j
j - s = 40 j= 40 + s
d + s = 40 d = 40 -s sub these into the original equation
40+s = 7 (40-s)
s = 30 papers
7 cos 210 = -6.06
7 sin 210 = -3.5i
Well let's say she flies for ONE hour.....then she should be 50.2 miles north and 1 hour's mph east
Bearing 68.9 is actually 21.1 in our usual coordinate 'plane' (haha)
tan 21.1 = 50.2 / mph mph = 130 mph
Volumecyl = pi r^2 h Plug in the values given
8.5 = pi (r^2) h lateral surface area = pi d h = 3.5 so h = 3.5 / (pi2r) sub into the equation
8.5 = pi r^2 ( 3.5/ pi 2 r)
8.5 = 3.5 r/2
17/3.5 = r = 4.857 cm
If you draw it out , you will find AD = 13 cm 13 + 12 + 4 + 9 = 38 cm
[Ar] 4s2 3d10 4p5 for 35 electrons in bromine
Ca is normally 1 s2 2s2 2p6 3s2 3p6 4s2 for 20 electrons
Argon AR has 18 electrons
so Ca could be [Ar] 4s2 now remove one electron to get Ca+ = [ Ar] 4s1
asin(0.1877) =~ 10.8186 o
