# Posts by matilda

Total # Posts: 29

**Math**

The point P = (4, 3) lies on the circle x2 + y2 = 25. Find an equation for the line that is tangent to the circle at P. This line meets the x-axis at a point Q. Find an equation for the other line through Q that is tangent to the circle, and identify its point of tangency

**Math**

The point P = (4, 3) lies on the circle x2 + y2 = 25. Find an equation for the line that is tangent to the circle at P. This line meets the x-axis at a point Q. Find an equation for the other line through Q that is tangent to the circle, and identify its point of tangency

**Math**

Find the center and the radius of the following circles: (a) x^2 +y^2 ?6x+y=3 (b)x^2 +y^2 +8x=0 (c)x^2 +y^2 +2x?8y=?8

**Math**

The graph of x2 ?6x+9+y2 +2y+1 = 25 is a circle. Where would the center of the circle be? What is the radius of the circle?

**Calculus**

How to derive cosh (3x) in terms of cosh (x) and sinh (x) ? Initially I start with 1/2 (e^3x+e^-3x) but I'm stuck from there because I don't know how to continue... :(

**stoichiometry**

in an attempt to to provide a means of generation of NO cheaply, gaseous NH3 is burned with 20% excess oxygen according to the equation 4NH3+5O2=4NO+6H2O The reaction is 70% complete. the NO is separated from the unreacted NH3, and thelatter is recycled. compute 1. moles ofNO ...

**English**

Question 1: A B C D Question 2: A C D Question 3: A B D Question 4: A B D

**Math**

At 2:00 pm, the temperature was12F. If the temperature dropped 5 degrees each hour, what was the temperature at 5:00 pm?

**English/Writing**

This very easy do it yourself Sorry

**Physics**

Some nucleus of 74X189 (atomic mass = 188.96191 u) undergoes - decay to become 75X189 (atomic mass = 188.95922 u). What is the energy (in MeV) released in this process?

**math**

friday

**Calculus**

Given x^2+y^2=4, find the equation of the tangent line at the point (-1,sq.rt.3). Then, at what point is the slope 0? What point is the slope -1? I have no clue what to do!

**History**

I am to write an historical investigation, and this is my first time writing something like that. Is an IB school. the question is "How did the factory system affect the life of the working class in Britain?"

**Chemistry**

Calculate the volume of oxygen at 27C and 740 mmHg which could be obtained by hesting 10g of potassium trioxochlorate (v)

**Chemistry**

Thank you, so when I did that I got -137kJ. so is their answer wrong or mine. They had 400kJ.

**Chemistry**

Hi, I am doing a practice test for my chemistry final and I do not understand one of the answer they gave for this thermochemical equation question. I do not understand how they got 400kJ. The question is: Butane has a deltaH of -2871 kJ/mol when it undergoes complete ...

**Goverment**

What is a bias paragraph?

**Algebra**

what is 18 percent of 240

**math**

the outer distance of a bicycle wheel is 95cm how many complete turns does the wheel make when the bicycle travels a distance of 350m?

**Religion**

What can be a good picture of a modern situation of the ninth station of the cross when jesus falls the third time?

**Chem 110**

Calculate amount of milliliters of 2.0 M HCl needed to neutralize 0.15 mol of NaOH

**chemistry**

Using the gas equation, V1=499ml; T1=25C+273K=298 P1=740mmHg At s.t.p P2=760mmHg; T2=273K; V2=? V2= 499*740*273 /760*298 =445.1 ans

**Chemistry**

21 litres

**4th grade math**

erunhgme685405930

**Business Math**

Cost + Mark-up = Price cost=$240, mark-up=.7S, price=S $240+.7S=S $240=.3S S=$800

**Business Math**

It says the mark up is based on price not cost so i believe that Reiny's answer is wrong because her answer is based on cost not price.

**economics**

problems question 4

**economics**

(a) According to table 4.1, by how much would coffee sales decline if the price of coffee increased by 20 percent? (b) If Starbucks raised its coffee prices by the same amount, would sales decline by more, less, or the same amount?

**algebra**

Can someone please help me with the following?: Factor each expression completely: x²-x-72 3x²-3x-168 Here is the way I have found to do these. First, make a couple of sets of parentheses. ( )( ) We put in the first letter. From X2 we can get ONLY X and X so put ...

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