cal

This page lists questions and answers that were posted by visitors named cal.

Questions

The following questions were asked by visitors named cal.

What is the sum of the coefficients (including “1”) of the balanced equation? __CaCO3 + __NaF __ CaF2 + __Na2CO3 4 5 6 7 8 If you start with 20.0 grams CaCO3, how many moles of CaCO3 do you have? 20.0 2.00 .200 .0200 .0386 If you start with .500 moles of...

write an exponential function whose graph passes throught the given points... (0,3)and (1,15)...(0,-5)and(-3,-135)...(0,-0.3)and(5,-9.6)

PLEASE HELP wiTH ALL OF THEse. I DON'T KNOW WHERE TO START---THANKS! 1. At 2pm the number of bacteria in a colony was 100, by 4pm it was 4000. Write an exponential function to model the population y of bacteria x hours after 2pm. 2.Using the information i...

Could you help me on solving these please? thanks -135 = -5b^-3 and -9.6=-.3b^x

What is the sum of the coefficients (including “1”) of the following reaction? Sodium sulfate + calciumhydroxide--> ???

Just one more.. Thanks for the last one! 16^(d-4) = 3^(3-d) solve for d

I am having trouble with this problem, thanks! If y varies jointly as x and the cube of z, and y=378 when x=4 and z=3, find y when x=9 and z=2 .

I am also having trouble with this one, thanks! If y varies jointly as x and the cube root of z, and y=120 when x=3 and z=8, find y when x=4 and z=27.

Could you please solve so I can double check my answers for the practice quiz? Thank You!! 1. Solve x^3 + 6x^2 + 13x + 10 = 0. a) –2 + 2i, –2 –2i, –2 b) 2 + i, 2 – i, –2 c) –2 + i, –2 – i, –2 d) 2 + 2i, 2 – 2i, –2 2. Find the discriminant and describe the...

I HAVE THESE ANSWERS FOR THE PROBLEMS. COULD YOU DOUBLE CHECK PLEASE, THIS IS A PRACTICE QUIZ WHICH ISN'T A GRADE IT JUST HELPS ME GET READY FOR THE TEST. 1) a 2) b 3) d 4) a 5) d 1. Solve x^3 + 6x^2 + 13x + 10 = 0. a) –2 + 2i, –2 –2i, –2 b) 2 + i, 2 – i,...

what is the rule for ___,68,___,94,___,120

What is the energy of a photon that has the same wavelength as a 12-eV electron? (h = 6.63 × 10-34 J×s)

Im in third grade and i don't understand colons.i have to proofread a paragraph and combine them using colons.

Andrew factored the expression 28x©ø-6x©÷-10x as 2x(14x©ø-3x©÷-5x) . But when Melissa applied the distributive law and multiplied out 2x(14x©ø-3x©÷-5x), she got 28x©ù-6x©ø-10x©÷; thus, Andrew¡¯s solution does not appear to check. Why is that? Please help...

subtract 31 m-31=r

what if i have 6 1/2 ft of lumber and i only need 3/5 how much is itZ?

Find the slope of the graph of the function at x = 5. f(x)= -2x^2+6/x^2

Use the Quotient Rule to differentiate the function. f(x)= 8x/x^5+3

Determine all values of x, (if any), at which the graph of the function has a horizontal tangent. y(x) = 6x/(x-9)^2

Use the Product Rule to differentiate f(u)= √u (5-u^6)

Find the second derivative of the function. f(x)= (3x^3+7)^7

Find dy/dx by implicit differentiation. x^3+8x+x^13y-y^6=4

Find dy/dx by implicit differentiation given that tan(4x+y)=4x

Determine all values of x, (if any), at which the graph of the function has a horizontal tangent. y(x) = 6x/(x-9)^2 when i workout this problem I get this: by quotient rule: dy/dx = ( (x-9)^2 (6) - 6x(2)(x-9))/(x-9)^4 = 0 at a horizontal tangent 6(x-9)^2...

Carbon disulfide is prepared by heating sulfur and charcoal. The chemical equation for this is S2 (g) + C (s) <---> CS2 (g) Kc = 9.40 at 900 K How many grams of CS2 (g) can be prepared by heating 11.7 moles of S2 (g) with excess carbon in a 5.95 L reactio...

How to proof tangential and normal components of a vector Thank you

Find the polar equation that has an eccentricity of 1 and has a horizontal directrix located 2 units above the pole. A: r=2/1+sin theta B: r=2/1+cos theta C: r=2/1-cos theta D: r=2/1-sin theta

Convert the polar form of the complex number into rectangular form. z = 3 sqrt 2cis 7pi/4 Show all your work. Show how you separately convert r and theta into a and b.

19) Find the product for the equations below. z₁ * z₂ (Use exact values, no decimals. Show your work) z₁= 1/2(cis pi/3) and z₂=3 (cos pi/6 + i sin pi/6)

8) The graph of r=4sinθ has which of the following characteristics? A: circle, diameter of 4, center at (0,2) B: circle, diameter of 4, center at (2,0) C: circle, radius of 2 center (4,0) D: circle, radius of 2, center at (0,4)

Answers

The following answers were posted by visitors named cal.

I posted under my friends name accidentally.. but number 2 is .2 because I found molar mass. Number 3 4 and 5 is where I get lost

it is not a test, it is a practice quiz they helped us make in order to prepare for the test, I just want help double checking my answers

1) a 2) b 3) d 4) a 5) d

I got it. Never mind.

I have these answer choices: x=9 and x=6 x=-9 x=-9 and x=6 x= 6 The graph has no horizontal tangents.

but the ans is f(x)= x^7(80-51x)/2√5-3x

I have these ans choices: A. f= 63x(7+3x^3)^5 (14+60x^3) B. f= 63x(7+3x^3)^5 (14+63x^3) C. f= 63x(7+3x)^5 (14+63x^3) D. f= 63x(7+3x^3)^5 (14-60x^3)

dy/dx = 3x^2+8+13x^12y / 6y^5-x^13

from the ans choices i choose: dy/dx= - 4x^2/x^2+1 is that right

what are the first three terms of the sequence a1=2 and an=3(an-1)2

Couldn't find any proofs for these Maybe a link would be great] Thanks

yes, i said ur mom