School and Work

The concept of it interests me, infrastructure and the like has always interested me. However the part that worries me is the math. I'm not terrible at math, never made less than a B but I am not great at it either where it all comes natural. With math, it usually takes me a bit of extra time to understand it and then I understand it. Algebra 1 and 2 i made about high B's. Adv. functions and modeling which had trig/algebra I made about a 98. When I have a calculator I usually do great.

So overall, I am worried about calculus and all of the other tough maths and I did not take pre-cal. As mentioned, I like the concept of building and helping shape urban environments it is just math I worry about failing. What do you think?

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What is the total pressure in mmHg of a gas mixture containing argon gas at 0.40 atm, helium gas at 395 mmHg, and nitrogen gas at 340 torr??

Question 2:
A gas mixture contains oxygen and argon at partial pressures of 0.60 atm and 375 mmHg....If nitrogen gas added to the sample increases the total pressure to 1280 torr, what is the partial pressure in torr of the nitrogen added?

Question 3:
Aluminum oxide can be formed from its elements. 4Al(s)+3O2(g)--->2Al2O3(s)
Part A
What volume of oxygen is needed at STP to completely react 5.0 g of aluminum?

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Y^2 = 3*(x^3)*sinx
Y= v(3*(x³sinx))
= (v3) (x^(3/2)* (sin^½x)

U=x^(3/2); V = sin^(½)x

Dy/dx= v3(U.V' + VU')
= v3[x^3/2*½ (sin^-½x)cosx + sin^(½)x*(3/2x^½)]

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Home >All Categories > Science & Mathematics >Physics >Open Question Jessica Walsh Member since:September 27, 2010Total points:269 (Level 2)a) How relative velocity is related to the direction in which rockets are launched or send into space ( provide 4 examples)
part b) the benefits to society and the environment of using specific direction for launching rockets? (provide 4 examples)Answer Question

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The problem is to subtract and simplify. . .

3 / (x^2+4x-5) - x / (x^2-1)

In the end I got . . .

(-x^2-2x+3) / (x+5)(x-1)(x+1)

If I'm wrong, can you show me how to do it please?
Thanks alot ! : )

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Suppose you are standing in the aisle of a bus that travels along a straight road at 100 km/ hr. If you hold a pencil still above your head. Then relative to the bus, the velocity of the pencil is 0 km/ hr, and relative to the road, the pencil has a horizontal velocity of:
a) less than 100 km/ hr
b) 100 km/ hr
c) more than 100 km/ hr

Suppose you release the pencil. While it is dropping, and relative to the road, the pencil still has a horizontal velocity of:
a) less than 100 km/ hr
b) 100 km/ hr
c) more than 100 km/ hr

This means that the pencil will strike the floor at a place directly:
a) behind you
b) at your feel below your hand
c) in front of you

Relative to you, the way the pencil drops
a) is the same as if the bus were at rest
b) depends on the velocity of the bus

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Home >All Categories > Science & Mathematics >Geography >Open Question Tootie Member since:May 15, 2009Total points:0 (Level 1)Bangladesh's principal problem preventing desired progress toward much better economic development is its:
A. Population distribution
B. Decision to sell the recently discovered natural gas rather than invent it in domestic consumption
C. Religion
D. Physical geography and dangerous natural hazardsAnswer Question

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the first one : 10x-30=15x-40
10=5x
x=2

the other equations are like this.......

Good luck

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5. Enzymes are catalysts that work in the human body. What happens to the enzymes during a reaction?
(Points : 1)
Enzymes are replaced in the reaction.

Enzymes are not consumed in the reaction.

Enzymes are turned into a new product.

Enzymes are used as reactants in the next reaction.

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Well, first things first...we need to factor that denominator...otherwise this is a nightmare...

Using long division, I get (x+1)(2x^2 + 7x - 6)

Now I can do something with that....

(x+3)/(2x^3+9x^2+13x+6) = A/(x+1) + (Bx+C)/(2x^2 + 7x - 6)

Multiply thru by the denominator on both sides....

2Ax^2 + 7Ax - 6A + (Bx+C)(x+1 ) = x + 3
2Ax^2 = 7Ax - 6A + Bx^2 + Bx + Cx + C = x + 3

Now we equate like terms.... So,

2Ax^2 + Bx^2 = 0 -> 2A + B = 0

Bx + Cx + 7Ax = x -> B + C + 7A = 1

And, -6A + C = 3

So, B = -2A and C = 3 + 6A

So, (-2A) + (3 + 6A) + 7A = 1 -> 11A = -2 -> A = -2/11

So, B = -2A = -2(-2/11) = 4/11

And C = 3 + 6A = 3 + 6(-2/11) = 21/11

So, (x+3)/(2x^3+9x^2+13x+6) = (-2/11)/(x+1) + ((4/11)x + (21/11))/(2x^2 + 7x - 6)

Hope that all makes sense to ya....

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14. Which of these is the domain of the function f(x)?

a) all real numbers, except 0
b) all real numbers except 1
c) all real numbers
d) only positive real numbers

17. which of these is not a linear equation?

a)y=9x
b)y=1/3x-2
c)y=1/x
d)2x+3y=0

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Write the Ka expression for H2S in water.

That's it.

I appreciate it!

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Home >All Categories > Science & Mathematics >Astronomy & Space >Open Question I I Member since:April 13, 2011Total points:80 (Level 1)carbon tetrachloride -
arsenic disulfide -
sulfur trioxide -
methane -Answer Question

by Enclosed... Member since:April 02, 2011Total points:778 (Level 2)*note: the numbers in brackets {} are subscripts
carbon tetrachloride - CCl{4}
arsenic disulfide - As{4}S{4}
sulfur trioxide - SO{3}
methane - CH{4}

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Home >All Categories > Science & Mathematics >Physics >Open Question mmmpizza... Member since:April 05, 2007Total points:98 (Level 1)a .50 kg mass attached to a spring undergoes simple harmonic motion with a period of .75 s what is the force constant of spring??
the answer says its 140 N/m but i cannot get that answer i am using
t=2(pi)vm/k
.75=6.28v(.15/k)
.0143=.5/k
34.9????Answer Question

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Home >All Categories > Science & Mathematics >Mathematics >Open Question DIscover... Member since:August 10, 2009Total points:528 (Level 2)Using complete sentences, explain how to find the equation of the line, in standard form and slope–intercept form, passing through (–1, –7) and (1, –1). Also compare the benefits of writing an equation in standard form to the benefits of writing an equation in slope–intercept form.Answer Question

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