Recent content by resresd

thanks, i hope this is better

i can't seem to get the 2s to show up superscript...is there a particular way?

in a circle with perimeter of 20cm a sector has radius r, angle θ radians and area Acm^2 prove that A= 25-(r-5)^2 A=1/2 r^2 θ c=2Πr the only thing that I can think to do is c=2Πr therefore 20=2Πr 10=Πr r=10/Π so then A=1/2 r^2 θ =1/2 (10/Π)^2 θ = θ (100/2Π^2)

the data given below are from a discrete distribution with positive integer values.there are two values which are unknown, namely "a" and "b". 8,5,3,6,5,9,a,b if the mean and varience respectively are 6.5 and 7.75, what are the possible values of "a" and "b"? so far i have that...

Thanks

yes sorry, i wrote it out in word and copy pasted it, the superscript obviously didn't show up. if 2k showa that the number of terms will be even then with the pattern of -1+1 the answere will be 0...how do i write it out though? is it just -1+1 with a recurring dot? can i do that?

2k [SIZE="6"]Σ (-1)n N=1 i am meant to write it out in full and i know that the answer is 0 which i think i understand as it will be -1+1-1+1 etc, but i don't know what to do about the k, it doesn't say that it is a constant, is it safe to assume it is anyway? and what do i do if it is...

oh wait...v=d/t and now i have t, yet another blunder, woops! thanks

thank you (also I've just noticed i wrote "write" meaning "right" which is more than mildly embarraing) only for b) of the first question it was looking for a distance (i realize i may have caused confusion with my bit about the answers i got as i clearly went momentarily insane) so i don't...

one type of aeroplane has a maximum acceleration on the ground of 3.5ms-2 a)for how many seconds must it accellerare along a runway in order to reach its take-off speed of 115ms-1? b) what is the minimum length of runway needed for it to reach this length? ummm, not entirely sure av...