Friday
April 18, 2014

Posts by Jess


Total # Posts: 816

pre-calc
Solve: cos(2x-180) - sin(x-90)=0 my work: cos2xcos180 + sin2xsin180= sinxcos90 - sin90cosx -cos2x - sin2x= cosx -cos^2x + sin^2x -2sinxcosx=cosx I'm stuck here. I tried subtracting cosx from both sides and making sin^2x into 1- cos^2x, but I still can't seem to solve t...

Pre-Calc
How do I solve this? My work has led me to a dead end. tan(45-x) + cot(45-x) =4 my work: (tan45 - tanx)/(1+ tan45tanx) + (cot45 - cotx)/(1 + cot45cotx) = 4 (1-tanx)/(1+tanx) + (1-cotx)/(1+cotx) = 4 Then I found a common denominator, giving me this: (2-2cotxtanx)/(1+cotx+tanx+c...

Chem
Does my work here look right? 3. One mole of an ideal gas expands adiabatically into a vacuum. Calculate q, delta-e, w, and delta-H for the process. q= 0 [adiabatic] w= -Pext(V2-V1) w= 0 delta-e = w + q delta-e = 0 + 0 = 0 delta-h= delta-e + P(delta V) delta-h= 0 + 0 = 0 does ...

Chem/Physics
1. How much work is necessary to accelerate a bullet having a mass of 5.0 g to a velocity of 1000. m/sec? This was on a chemistry problem set of mine, and it seems like a very physics-oriented question [I have not taken physics.] Could someone point me in the right direction a...

Chem
A few classmates and I were arguing about a problem we had to do for homework. The problem states: Limestone, CaCO3, when subjected to a temperature of 900 degrees C in a kiln, decomposes to calcium oxide and carbon dioxide . How much heat is evolved/absorbed when one gram of ...

8th grade algebra
ten over eight = what over ten????? please help me!!!!!!!!!! 10 / 8 = x / 10 This means that 8 * x = 10 * 10 Solve for x.

cHEMISTRY
Strontium metal is responsible for the red color in fireworks. Fireworks manufacturers use strontium carbonate, which can be produced by combining strontium metal, graphite (C), and oxygen gas. The formation of one mole of SrCO3 releases 1.220 x 10^3 kJ of energy. a) Write the...

Maths
3x + 1 < -2 subtract one from each side, then divide both sides by three. first you need to look at each side of what ever your looking at and subtract 1 from each number then divide the numbers by 3 I have trouble with math all the time. so I was wondering if you could hel...

math
suppose that the gas tank of a car holds 12 gallons and that the car uses 1/ 20 of a gallon per mile .let x be the nuber of miles the car has gone since the tank was filled? (1/20x)= 12 so now get x by itslef! (1/20x)/ (1/20)= 12/(1/20) x= 240! yeah I am good! that is good! go...

math
suppose that the gas tank of a car holds 12 gallons and that the car uses 1/ 20 of a gallon per mile .let x be the nuber of miles the car has gone since the tank was filled? (1/20x)= 12 so now get x by itslef! (1/20x)/ (1/20)= 12/(1/20) x= 240! yeah I am good! that is good! go...

math
97x+1/4=4 okay well minus 4 from 1/4 wich gives you?? 97x= 15/4 now get x by itself by dividing 97 by 15/4 wow! 1). Subtract 1/4 from both sides 97x+1/4-1/4=4-1/4 97x=31/4 (3.75) 2). Devide both sides by 97 97x/97=3.75/97 <-or 3.75 devided by 97 x=?

math
97x+14=4 First, subtract 14 from both sides. Then, let us know if you get stuck.

math
gasoline consumption problem suppose that the gas tank of a car holds 12 gallons and that the car uses 1/ 20 of a gallon per mile .let x be the nuber of miles the car has gone since the tank was filled? car holds 12 gallons 1/20 gallon/mile 12*20 = 240 miles possible what is t...

word unscramble
daes sldrp

KEYBOARDING
The main difference between block letter style and modified block letter style is/are the

Philosophy
G > (J > O) ~ ~ M v V ~ O * ~ ~ J ~ V > K / ~ G ~ (K * M) / V (L * A) > Z W v S ~(~ L * T) S > ~ (P > V) A / S = ~ W / Z v T Rules of replacment- DeMorgans Rule**

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