Recent content by js14

divide complex number by conjugate. 1+3(sqrt-1)/ 2+(sqrt-1) The answer that i get is (5i/5)+1. Is this correct?

I understand that answer its definitely correct, however my online homework has no sigma signs(meaning i can enter an answer like the one you show) so i was just suggesting that there must be a different way to write the equation. For example there is a similar question in my precalc book with...

I guess no one knows the correct answer...?

Yea I saw the formula with the sigma notation but my online homework dosent have sigma signs so their must be another way to write the sequence using only fractions...?

I got that part of the answer but now it asks this: Find a formula for the total distance the ball has traveled at the instant it hits the ground the nth time. I solved the problem like in the above problems. Is 9-(1/3)^n-3 the right formula?

ok the answer is 53/9!

Does this work? d1=3 second time d2=3*K=1 Third time d3=1*k=1/3 Forth time d4=K(1/3)=1/9 Now adding up d1+d2+d3+d4, we get the total distance d=40/9

A ball is dropped from a height of 3 ft. The elasticity of the ball is such that it always bounces up one-third the distance it has fallen. (a) Find the total distance the ball has traveled at the instant it hits the ground the fourth time. (Enter your answer as an improper fraction.) Can...

Two amateur meteorologist, living 4km apart (4000m), see a storm approaching. The one farthest from the storm hears a loud clap of thunder 9 sec after the one nearest. Assuming the speed of sound is 340m/sec, determine an equation that models possible locations for the storm at that time...

i have x^2/8 + y^2/(8/7) =1.

ok I have it now. i was looking at it wrong. 7/2 squares to 49/4 so a^2=49/4. and when i use the formula c^2 = a^2 + b^2 to find b^2. i plug 7 into c^2 and 49/4 into a^2. this gives me (7)^2=49/4 +b^2. then i square 7 to give me 49=49/4+b^2 then subtract 49/4 to get b^2 by itself and I get...

yes I mean 7/2. anyway i don't know how to find b. the only thing i can think of is to square 7/2 and 7 to give me 7/4 and 49 and then subtract them to give me b. that doesn't work though. what's my next step?

Ok the the points for the vertices are (2 sqrt 2,0) (-2 sqrt 2,0) for the foci I have points (sqrt (64/7),0) (-sqrt(-64/7),0) and the same radical that you put in your last post + or minus sqrt (65/7) divided by 2 sqrt 2 x as the asymptotes . except the x shoulnd be in the denomonator it shound...

When I tried to solve this i got + or - 2 sqrt 2,0 for the vertices, + or - sqrt (64/7),0 as the focus and + or minus sqrt (65/7) divided by 2 sqrt 2x as the asymptotes. do you understand this better?

Find the vertices, foci, and asymptotes of the hyperbola. x^2 − 7y^2 = 8 When I tried to solve this i got + or - 2 sqrt 2 for the vertices, + or - sqrt 64/7,0 as the focus and + or minus sqrt 65/7 divided by 2 sqrt 2x as the asymptotes. is this correct?