Mathematics - 10 June 2007

1. Perform the following complex number multiplication and write the answer in standard form

(-1+5i)(-3-5i)

2. Scott drove 220 miles using 8 gallons of gas. At the same rate, how many gallons of gas does he need for a trip of 308 miles?

3. Simplify the complex number as much as possible

i^31

Thank you

2007-06-10 02:14:35 · 7 answers · asked by CHRISTOPHER R 1

2007-06-10 02:09:10 · 6 answers · asked by sam s 2

2007-06-10 02:06:32 · 1 answers · asked by sam s 2

1. Write in simplify radical form by rationalizing the denominator

2√2+1/-5√2+3

2. An aquarium holds 7700 liters of water. There are two pipes that can be use to fill the tank. The first pipe alone can fill the tank in 77 minutes. The second pipe can fill the tank in 44 minutes by itself. When both pipes are working together, how long does it take them to fill the tank?

3. Solve for z. Where z is a real number, if there is more than one solution seperate them by commas.

√z+10=3

2007-06-10 01:56:42 · 4 answers · asked by CHRISTOPHER R 1

I have problem like this one: there is a relation like,
y=sgn(x)*(x-2); so here y is expressed as a function of x.
I want to express x as a function of y. How to do that? sgn(x)=|x|/x, (x not equal to zero).

Can you also tell me about any website other than yahoo answers where I can discuss my doubts concerning higher maths/physics?

2007-06-10 01:39:37 · 7 answers · asked by Roy 2

I can integrate, 4sin4x = -cos4x but how do I go about doing it if its a squared value of sin?

2007-06-10 01:08:42 · 5 answers · asked by attilioi t 1

Does it mean the equations have equal roots? Or the equations have common solution(s)?

2007-06-10 00:46:27 · 5 answers · asked by Akilesh - Internet Undertaker 7

2007-06-10 00:24:52 · 3 answers · asked by janice m 1

My questio nis

I have the points (1,2) nad (-2,4) and I have to find the co-ords of a point that divides them in a ratio of 2:3

If my high school maths still stands by me, the distance is sqrt(13)

Is that even relevant, because how would I find the point ?

2007-06-10 00:11:45 · 5 answers · asked by hey mickey you're so fine 3