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What ions are present in NaCl, Na2CO3, MgSO4, and NH4Cl?

How do you prove #cos 3 theta = 4 cos^3 theta  3 cos theta#?

How do you condense #ln(1+x^9)+1/2(ln(x)ln(sin(x) #?

Question #f45fa

What are the asymptotes for #(x^2+4x+3)/(x^2  9)#?

How do you find the derivative of #sin(x)/[1cos(x)]#?

How do you find the determinant of #((1, 0, 0, 0), (sqrt3, 2, 0, 0), (0.003, 0, 3, 0), (1.432, sqrt37, pi, 1))#?

For #f(x)=2^x # what is the equation of the tangent line at #x=5#?

A ball with a mass of #14 kg# moving at #15 m/s# hits a still ball with a mass of #17 kg#. If the first ball stops moving, how fast is the second ball moving? How much kinetic energy was lost as heat in the collision?

Question #d9e88

A circle has a center at #(1 ,3 )# and passes through #(2 ,4 )#. What is the length of an arc covering #pi # radians on the circle?

How do you determine whether the function #f(x)=3x^5  20x^3# is concave up or concave down and its intervals?

What is the domain and range of #y=2x6#?

∥v∥=3
∥w∥=4
The angle between v and w is 1.2 radians.
How to calculate ? a) v⋅w =
,(b) ∥1v+1w∥=
, (c) ∥4v−4w∥=

An atom contains 70 protons, 70 electrons, and 99 neutrons. What is the mass number?

A weather rocket is launched straight up. Seconds into the flight, its velocity is 130m/s and it is accelerating at 19 m/s^2. At this instant, the rocket's mass is 59 kg and it is losing mass at the rate of 0.55 kg/s. What is the net force on the rocket?

A balanced lever has two weights on it, the first with mass #3 kg # and the second with mass #37 kg#. If the first weight is # 9 m# from the fulcrum, how far is the second weight from the fulcrum?

The difference between the degree measures of two supplementary angles is 80°. What is the degree number of the larger angle?

Question #a8f63

How would you balance: C3H8 + O2 > CO2 + H2O?

Given #f(x) = 2x + 1#, #g(x) = 3x³ 1# how do you find f(g(x))?

What is #sqrt{sqrt3 + sqrt (3 + 8 sqrt (7 + 4 sqrt3#?

How do you find the Integral of #sqrt(x^2  16)/ x dx#?

How do you find the determinant of #((2, 3, 5), (0, 1, 3), (0, 0, 2))#?

How do you find the asymptotes for #f(x) = (3x + 5) / (2x  3)#?

How does genetics use the principles of probability?

What is the derivative of #2^sin(pi*x)#?

How do you use the second fundamental theorem of Calculus to find the derivative of given #int cos 2t dt# from x to pi/4?

Question #6dc14

What is needed to produce an electromagnet?

What are the applications of power series in electrical engineering?

A 2150 kg truck traveling north at 42 km/h turns east and accelerates to 61 km/h. (a) What is the change in the truck's kinetic energy? (b) What is the magnitude of the change in its momentum ?

What type of compound is CH3CH2CH3?

How do you evaluate #sec(18pi)#?

Question #4444b

What is the binomial theorem?

If a cup of coffee has temperature 95∘C in a room where the temperature is 20∘C,
then, according to Newton's Law of Cooling, the temperature of the coffee after t
minutes is T(x)=20+75e^(t/50). ?

Why can't a triangle have a right angle and an obtuse angle?

Question #55e72

Given #f(x)=x^2+1# with domain #{2,1,0, 1,3}# what is the range?

Question #adc16

How do you prove the statement lim as x approaches 4 for # (x^2) = 4# using the epsilon and delta definition?

How do you simplify #1/(2+3i)# and write in a+bi form?

What are synchronous machines?

What is acetylcholine classified as?

It takes 23.5 kJ of heat energy to raise the temperature of 100 g of a substance by 50°C. What is the substance?

What is the least squares regression model for the following data points?: (1,3), (2,6), (3,19), (2,7), (8,9), (10,25)

Question #ce2b6

Does #a_n=x^n/(n!) # converge for any x?

If #A= <6 ,9 ,1 ># and #B= <4 ,1 ,4 >#, what is #A*B A B#?

What is the greatest common factor of 21 and 63?

What is the trigonometric form of #12 e^( ( pi)/2 i ) #?

What is the angle between #<1 ,3,8># and #< 4,1,5>#?

How do you translate into symbols: The difference between n and 14?

The girl's brother stands at the edge of the Golden Gate Bridge and throws a penny upwards at 29 m/s at an angle of 34°. How long does it take the penny to fall to the water, 227m below? How far from the base of the bridge does the penny hit the water?

Question #eefeb

How do you rewrite #((a^2b^5)/c^3)^2# using a positive exponent?

If a current of 40 mA flows through a series circuit consisting of a 0.4 µF capacitor and a resistor in series with a 4 kHz, 40 Vac source, what is the total circuit impedance?

How do you implicitly differentiate #ln(xy)=xy #?

Question #490a9

What is the angle between #<1,7,2 > # and #<3,5,1> #?

How do you determine if #f(x) = x^3 + x# is an even or odd function?

How do you find the derivative of #lnxsqrt(x^2+1)#?

How do you graph #x + y = –2#?

What is the difference between mole and molecule?

Is it correct to write #1^@=2pi/360^@#? Yes or no, and also why?

A projectile is shot from the ground at an angle of #(5 pi)/12 # and a speed of #4/9 m/s#. Factoring in both horizontal and vertical movement, what will the projectile's distance from the starting point be when it reaches its maximum height?

The cost function for a product is C(x)=0.8x^2 +120x+110.
How to find average cost over [0,600] ?

What is the limit of #sinx / x# as x goes to infinity?

How do you solve #2/(3+x) = 25#?