# Posts by Rei

Total # Posts: 31

Algebra
Ahhh! That makes a lot more sense, thanks for the breakdown. I knew I was doing SOMETHING wrong haha. Thanks again :D

Algebra
Thanks. My problem from there is figuring out how to factor it.. I have x^2+x-3=0. Theres no factors of -3 that add up to 1. -3+1 = -2 -1+3= 2 When i try to use the quadratic formula I end up with: (-1+/1(sqrt)13)/2 Am I missing something?

Algebra
(x/x-2)+(x-1/x+1)=-1 So far I was able to get it to x + (x-1) = -(x-2)(x+1) through cross multiplying, but I'm kinda lost with what to do now. Should I convert the right side to a polynomial and add the left side, then bring it all to 1 side so it = 0? Thanks!

Math
Ohhh! Thank you so much!

Math
Hi! I was wondering after you simplify a radical, can you add the rest of the equation to whats outside of the radical? ex. 20 + 10?35 Would that be 30?35 or would it stay as 20+10?35 Thank you in advance, this is really bugging me! :)

Math (Algebra)
*facepalm* That tricked me. I think it's (152, 7316) & (0,20)? I guess ANY number times 0 is a factor of 0... So I did -152 x 0=0 and -152+0 = -152. That gave me (x-152)(x+0)

Math (Algebra)
Ok.. I understand how to eliminate y and everything, then you factor it as normal. The solutions to that equation were (-1, 1) and (2,4). I'm working on another one and used the same steps. y=48x+20 -(y=-x^2+200x+20) and i ended up with : 0=x^2-152x This can't be ...

Math (Algebra)
Sorry :) I must've gotten something confused. I think I get it now. Thank you!

Math (Algebra)
I understand how to do that, thats substitution. How can I solve it with elimination?

Math (Algebra)
I have to solve a few systems through elimination, but I'm still not quite sure how to do it.. The first is y=x^2 and y=x+2 Can someone show me how exactly it is worked out so I can try the second one myself?

Math
What is 0.7 x 10 = x 10 = 0.07 x 10 = x 10 = 0.23 x 10 = 0.023 x 10 = 0.004 x 10 = 0.404 x 10 =

Chemistry
What mass of Na2S is produced when 20g of sodium reacts with excess sulfur?

Math
12

average rate of change
Please help.. Determine the value of "g" so that the average rate of change of the function h(x)=x^2+3x+2 on the interval -3≤x≤g is -1. Thank you.

instantaneous rate of change problem
Joe is investigating the rate of change of the function y=cos x on the interval xE[0,2π]. He notices that the graph of y=cos x passes through the x-axis at 45°. He also determines the instantaneous rate of change at x = 0, π, and 2π by inspection. Based on ...

combining functions
Given: f(x)=2x^2-x+1 g(x)=2 sin x h(x)=3^x Determine: a) f(g(x)) b) (h^-1 o f)(x) c) g(f(h(x)))) Please show steps, thank you very much.

product of function
Given: f(x)=2 cos x and g(x)=sin x. Which of these expressions is equivalent to (fxg)(π/16)? a) cos π/8 b) sin π/8 c) cos π/4 d) sin π/4 Please explain the answer, thank you.

physics
A man stands on the roof of a 10.0 -tall building and throws a rock with a velocity of magnitude 30.0 at an angle of 34.0 above the horizontal. You can ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock strikes ...

physics
A man stands on the roof of a 10.0 -tall building and throws a rock with a velocity of magnitude 30.0 at an angle of 34.0 above the horizontal. You can ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock strikes ...

physics - Energy
I got it wrong. I did exactly what you said. Multiplied m times g times h then multiplied by 2. Sq root that number and got 2778.926411 but it was wrong.

physics - Energy
Thank you!

physics - Energy
An ore car of mass 41000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 9.6 m lower vertically, is a horizontally situated spring with constant 4.7 × 10^ 5 N/m. The acceleration of gravity is 9.8 m/s^ 2. Ignore friction. How much ...

physics - Energy
Just giving the equation to solve the problem would be nice too!

physics - Energy
A 0.280 kg block on a vertical spring with a spring constant of 4.12 × 10^ 3 N/m is pushed downward, compressing the spring 0.0600 m. When released, the block leaves the spring and travels upward vertically. The acceleration of gravity is 9.81 m/s^ 2. How high does it ...

History (writing)
My college instructor is asking me to define and discuss one of the themes the entire class read about for homework. I've chosen to do a paper on Americanization of the Mexican American woman. However I don't understand how I should define and discuss the theme while ...

algebra
8>7n+1 8-1>7n+1-1 7>7n 1>n * You do not change the sign because you did not divide by a negative. You only change the sign when you do divide by a negative number.

government