# Posts by kem

Total # Posts: 29

**Analytic geometry**

Find the equation of set of all points P(x,y) that is twice as far from (-8,8) as from (-2,2).

**physics help**

The distance between the midponts of two metal balls.P and Q,respectively of masses 55 kg and 70 kg is 80 cm calculate the gravitational force that P exerts on Q7 (b)give only the magnitude of the force that Q exerts on P (c)if Q Is now replaced by a ball that 1/2 its ...

**science chemistory**

Limestone is mostly calcium carbonate(CaCO3.john wants to know how much calcium carbonate is in a sample of mass 3,5 g of limestone.to the limestone he then adds concentrated hydrochloric acid (HCl).the products that form are carbon dioxide (CO2),calcium chloride (CaCl2) and ...

**science chemistory**

CaCO3 2HCl forms CO2 CaCl2 H2O 1.calculate the molar mass of calcium chloride produce 2.calculate the number of moles of calcium carbonate 3.calculate the mass of calcium carbonate

**physical science chemistry**

Thanks i would be thankfull

**physical science chemistry**

Fill in the missing words Ionisation energy, water, melting point, electronegativity, non-polar, solvent, pair, boiling points, polar A covalent bond is formed when a 1________ of electrons is shared between the bonding atoms.when the electrons are shared equally,a 2_______ ...

**trigonometry math help**

If cos 20=m determine the values of the following in terms of m. (a)sin 250 (b)sin 20 thanks

**math trigonometry**

Simplify cos180*sin225*cos80/sin170*tan135

**math**

F(x)=-(x+1)^2+4 determine the nature of the roots

**melissa**

How did you find f1,f2 and f3?

**math**

It's 3x^2+kx-k=3k

**math**

3x^2 kx-k=3x

**math**

Its 3x^2 kx-k=3x prove that this equation has rational roots for all rational values of K.

**math**

3x^2 kx-k=3x prove that this equation has rational roots for all ration values of K thanks

**physics**

A rocket of mass 5 000 kg is launched upwards into the sky at an acceleration of 20 m.s^-2. (a) Calculate the magnitude (b) calculate the direction of the thrust of the rocket's engines thanks in advance

**math**

How did u get 24 11=35

**math**

After finding the differences how will i find the tenth term?

**math**

Yes i do

**math**

0,3,8,15,24 how do i calculate the tenth term

**physics**

A block of 25 is pulled horizontally on a rough surface by the force 120N.the coefficient of friction between the surface is 0.34 how do i calculate the accelation of the block

**chemistry**

How do i calculate a,b and c please help me

**chemistry**

Sorry My mistake it's 300m^3

**chemistry**

14g of lithium hydroxide dissolves in 500cm^3 of water.in titration ,300m7^3 is used to neutralise sulphuric acid of 0,2mol.dm^-3 how do i calculate (a)concentation of a base and calculate for (c)volume of the acid and (c)which mass of Alkaline was used thanks in advance.

**Geography**

What are the causes of the pressure belts

**math**

As a part of a unit on weather students recorded the outroor temperature at 8:30 AM what was the difference between the weeks highest and lowest morning temperatures

**Math help NOW!!!!! Plz**

How to solve by completely the square. X^2+18x+10=0

**chemistry**

A CUBIC PIECE OF METER MEASURES 3.00CM ON EACH EDGE. IF THE METAL IS NICKLE WHOSE DENSITY IS 8.90G/CM^3.WHAT IS THE MASS OF CUBE

**english**

Select the sentence that has correct pronoun usage. Julie plans to travel this summer with Oscar and me. Julie plans to travel this summer with Oscar and I.

**physics**

l=(T^2*g)/4 yapýcan