Wednesday

September 3, 2014

September 3, 2014

Total # Posts: 2,434

**Chem**

Sort the following chromium compounds by whether the cation is chromium(II) or chromium(III). Cr2S3, Cr3P2, Crl3, CrO, CrBr2, CrN. How would I solve this? Soo stuck. Thanks! -MC
*February 26, 2014*

**Chem**

Thank you!
*February 25, 2014*

**Chem**

What is the formula for an ionic compound that contains the elements calcium and fluorine? Is it CaF2? (small 2) Thanks -MC
*February 25, 2014*

**Chem**

What would the Lewis Dot structures for Group 5A (15) and Group 7A (17) look like? Thanks -MC
*February 20, 2014*

**Chem**

I'm not sure about this: Rank from most to least valence electrons- Xe, In, I, Sb, Rb Thanks -MC
*February 20, 2014*

**Chem**

Thank you SO much -MC
*February 19, 2014*

**Chem**

Can someone please check this for me? It's ranking the following bonds in order of increasing ionic bond character. Cl-Cl C-H H-Cl Mg-C H-O Na-Cl Ca-O Cs-F I'm not sure where Fe-O, and Fe-C fall. Thanks -MC
*February 19, 2014*

**Chemistry**

Thank you! -MC
*February 7, 2014*

**Chemistry**

Rank Cd, Br, and Si from worst to best conductor of electricity. Is it Br, Cd, Si? Thanks -MC
*February 7, 2014*

**Chem (Specific Heat)**

I am confused as to how to solve this problem. Can someone please tell me the steps? I know SH = heat/ mass x change in temp. What is the specific heat of a metal if 7.74 × 103 J of energy is required to warm a 75.0 g sample of the metal from 10 °C to 125 °C? ...
*February 6, 2014*

**Chem**

Not sure how to solve: If a sugar solution has a density of 0.98 g/cm^3, what is the percent mass sugar content? Thanks -MC
*February 5, 2014*

**Chem**

Okay, thank you! -MC
*February 5, 2014*

**Chem**

Just taking a bar of aluminum and another metal and measuring differences in density
*February 5, 2014*

**Chem**

When conducting an experiment on determining density, what would the variable be? not the mass or temperature...can't figure it out. Thanks -MC
*February 5, 2014*

**chemistry**

The answer when rounded is 40, so I got it! -MC
*February 1, 2014*

**chemistry**

Just need help solving this one, please: The grams of fat in one avocado if it has 405 Calories, 13 g of carbohydrate, and 5 g of protein Express your answer using one significant figure. Thanks -MC
*February 1, 2014*

**chemistry**

For this one- The grams of sugar (carbohydrate) in one can of cola if it has 140 Cal and no fat and no protein. Express your answer using one significant figure. Is the answer 40 once rounded to sig figs? Thanks
*February 1, 2014*

**chemistry**

I need help solving this: The grams of protein in 1 cup of soup that has 110 Cal with 7 g of fat and 9 g of carbohydrate. Express your answer using one significant figure. Thanks -MC
*February 1, 2014*

**Chemistry**

Nevermind, I think the answer is 192, but how do I express this in one sig fig?
*February 1, 2014*

**Chemistry**

The total Calories for 2 tablespoons of crunchy peanut butter that contains 6 g of carbohydrate, 16 g of fat, and 7 g of protein. Express your answer using one significant figure. How do I figure out the amount of kcal per carb fat and protein? Thanks -MC
*February 1, 2014*

**chemistry**

So what I'm getting as I set up the equation is 60g x 125 x 60 and that doesn't seem right
*January 29, 2014*

**chemistry**

I'm sorry, I haven't really understood what you've done. could you maybe break it down for me? I'm new at this whole chem thing. What is Tf and Ti? She's good, she's about to get her degree in education! Thanks -MC
*January 29, 2014*

**chemistry**

I'm not sure how to solve this: If 125 cal of heat is applied to a 60.0-g piece of copper at 20.0∘C , what will the final temperature be? The specific heat of copper is 0.0920 cal/(g⋅∘C). Express the final temperature numerically in degrees Celsius Thanks
*January 29, 2014*

**Chemistry**

I have this problem: How much heat energy is required to raise the temperature of 0.365kg of copper from 23.0 ∘C to 60.0 ∘C? The specific heat of copper is 0.0920 cal/(g⋅∘C). I did the equation using formula Heat= mass x change in temperature x specific...
*January 29, 2014*

**Chemistry**

Also this please- The specific gravity of a vegetable oil is 0.85. What is its density? How do I figure it out?
*January 27, 2014*

**Chemistry**

it's 10^-2g
*January 27, 2014*

**Chemistry**

1.A patient needs 2.10×10−2g of a sulfa drug. There are 8.00mg tablets in stock. How many tablets should be given? Really need help with this! :/ Thanks -MC
*January 27, 2014*

**Math**

I need help with these please: 4. Simplify sqrt27/75. The answer should be in simplest form 5. Solve for w. (3w-15) (w^2 + 11w +30) = 0 Thanks -MC
*November 20, 2013*

**Math**

THank you! -MC
*September 4, 2013*

**Math**

Write 1.3% as a decimal- .013 Write 0.384 as a percentage- 38.4% Are these correct? Thanks
*September 4, 2013*

**Math**

|6-8| - |9| = -7?
*September 4, 2013*

**math**

Can someone please help me on this question! Research subjects that are divided up based on gender, age, etc. to be compared to people of the same group is what type of design experiment?
*June 20, 2013*

**Math**

I'm really stuck on these STATS questions.Can someone please help! 1. The probability of a car in a population having faulty brakes is .05. If we take a sample of 150 cars, find the standard deviation of the sampling distribution. 2. The strength of ten I-beams produced in...
*June 20, 2013*

**math**

Can I gt some help on these questions! 1.Research subjects that are divided up based on gender, age, etc. to be compared to people of the same group is what type of design experiment? 2. A biologist collects a sample of 50 snakes. The snakes have a mean length of 25 cm with a ...
*June 20, 2013*

**Math**

Thanks
*June 20, 2013*

**Math**

No clue how to solve this. If you have performed a linear regression of data that ranges from 1-10 and has a y=2x+5, what is the extrapolated value for y at 11
*June 20, 2013*

**Math**

1. Exponential growth follows the formula y=a(1+r)^x and exponential decay follows the formula y=a(1-r)^x.. This seems obviously TRUE But now I'm having doubts about the decay formula Is this true or false?
*June 20, 2013*

**math**

Thanks for the compliment haha Been using this username on Jiskha for 5 years now
*June 20, 2013*

**math**

Got it!
*June 20, 2013*

**math**

I think its (-infinity, infinity)
*June 20, 2013*

**math**

Not sure about this question... 1. State the range for the function f(x) = -log 1/2(base) (x-1) + 2 ..help?
*June 20, 2013*

**math**

ok, i'll remember that next time
*June 20, 2013*

**math**

1. Find f^1 (x) for f(x) = -2 / 5x+3 I got f^-1 (x) = -2 - 3x / 5x Is that right?
*June 20, 2013*

**math**

1. The following functions are inverses of each other: f(x) = 3x - 7 and g(x)= x+3 / 7 False, right?
*June 20, 2013*

**math**

It's cool, that's the point
*June 20, 2013*

**math**

Thanks. ...and I'm a girl
*June 20, 2013*

**math**

I went through and solved this problem plenty of times...and my answer always comes out to 5/6..however, that's not even one of the choices. One of the choices is 6/5 though... maybe I'm doing somehting wrong 1. Find the missing value. Y is directly proportional to x ...
*June 20, 2013*

**math**

Is this correct? 1. Write v as the sum of 2 vector components if v = 2i + j and w = 3i - 2j v = (12/13i - 8/13j) + (14/13i + 21/13j)
*June 19, 2013*

**math**

18. Exponential growth follows the formula y= a(1+r)^x and exponential decay follows the formula y= a (1-r)^x. False? 23. In controlled experiments, the researcher is able to find a casual relationship between the variables- True 27. The explanatory and response variables in ...
*June 19, 2013*

**Math**

1. Find the angle between the vectors, approximate your answer to the nearest tenth. v= (-4, -3) w= (2, 6) Answer: 145.3 degrees 17. One type of data that is non linear in nature is the exponential function. -False? 19. Exponential data follows the equation y= ab^x. True?
*June 19, 2013*

**Math**

Can someone please double check my answers. 1. What pattern does the logarithmic function exhibit? a. y = b+a(lnx) b. y = a+b(lnx) c. y = ax+b d. y = axb I think A and B both look right..I just went with B. 2. Let f(x) = log6x and g(x) = log1/2x. For all x>1, f(x)>g(x) ...
*June 18, 2013*

**math**

Can someone please double check my answers. 1. What pattern does the logarithmic function exhibit? a. y = b+a(lnx) b. y = a+b(lnx) c. y = ax+b d. y = axb I think A and B both look right..I just went with B. 2. Let f(x) = log6x and g(x) = log1/2x. For all x>1, f(x)>g(x) ...
*June 18, 2013*

**Math**

Can someone please double check my answers (My answers are in Capital) 1. If you produce a million products a day and you want to test ten of them to determine if they are up to standard, which ones will you choose? a. The second ten B. TEN RANDOM UNITS c. The last ten d. The ...
*June 18, 2013*

**math**

4. When taking a power function and transforming it into a linear function, you get y=ax^b and is equivalent to log y=(log a + b + x) FALSE 5. Exponential data follows the equation y = ab^x TRUE 6. One type of data set that is non-linear in nature is the exponential function TRUE
*June 17, 2013*

**math**

Can someone please double check my answers (My answers are in Capital) 1. If you produce a million products a day and you want to test ten of them to determine if they are up to standard, which ones will you choose? a. The second ten B. TEN RANDOM UNITS c. The last ten d. The ...
*June 17, 2013*

**math**

Thanks!! -MC
*June 17, 2013*

**math**

4. When writing a vector as the sum of two vector components, the first vector to calculate is just the projection of a vector onto another vector. True 5. Work represents a scalar value. True
*June 17, 2013*

**math**

Can I please get my answers double checked? True or False 1. The tangent function is used to find the angel between two vectors. True 2. If two vectors are orthogonal, then their dot product is -1. False 3. The length of the projected vector is always shorter than the length ...
*June 17, 2013*

**STATS**

nevermind
*June 15, 2013*

**STATS**

I have done parts of this question (they are capitalized)which I was hoping someone could double check, and there are other parts that I need help on. 1. The manager of a fitness center is interested in the average weight-to-height ratio of the center's clients. Since the ...
*June 15, 2013*

**Stats**

I have done parts of this question (they are capitalized)which I was hoping someone could double check, and there are other parts that I need help on. 1. The manager of a fitness center is interested in the average weight-to-height ratio of the center's clients. Since the ...
*June 14, 2013*

**math**

THnak you!
*June 12, 2013*

**math**

Can someone please show me step by step how to solve this, I've been stuck. Find the common ration r of the geometric series an that satisfies the following conditions: c=4, S=16 I would reallyy appreciate it if someone could help me
*June 12, 2013*

**math**

I really need help A person opens up a savings account that pays 4% interest compounded quarterly. The person makes deposits every three months, including the initial deposit of $200 each. How many years will it take for the account to reach $30,000? For this question, I use ...
*June 11, 2013*

**Stats**

NEVERMIND. I figured it out Sample is neither C nor B....It is D
*June 11, 2013*

**Stats**

Sooo I'm a little confused on these 2 questions: 1. Sample: a. method of collecting, presenting, and describing sample data b. a numerical value summarizing all the data of an entire population c. a collection, or set, of individuals, objects, or event whose properties are...
*June 11, 2013*

**Math**

So if it is true for n>3, would the answer be true?
*June 9, 2013*

**Math**

Can someone check my answers and help me 1. A vector in standard position has its initial points at (0,0) True? 2. The general formula for finding the probability of two events A and B that are not mutually exclusive and overlap is given by: P(A or B) = P(A) + P(B) + P(A and B...
*June 9, 2013*

**Math**

Can I get some help? 1. If v = (-5, -3), -5 ||v||^2 2. For the following vector v, find ||u||, the unit vector with the same direction angle as v. V = -25j Does u = -j? 3. True or False: To graphically add two vectors, V+w, using the tip-to-tail method, place the tail of w to ...
*June 8, 2013*

**Math**

For the 2nd one I'm getting 299..however my answer choices are 500, 450, 280, or the ball travels an infinite distance
*June 8, 2013*

**Math**

So I'm getting false for #3...
*June 8, 2013*

**Math**

I need some help with these quesitons 1. a1 = -1, and an = 4/3an-1 for n = 2, 3, 4, ___. What is the common ration, r, for this sequence? 2. A rubber ball is dropped from a height of 50 ft. Assume that each bounce of the ball is vertical and that each bounce reaches a height ...
*June 8, 2013*

**Math**

I need some help with these quesitons 1. a1 = -1, and an = 4/3an-1 for n = 2, 3, 4, ___. What is the common ration, r, for this sequence? 2. A rubber ball is dropped from a height of 50 ft. Assume that each bounce of the ball is vertical and that each bounce reaches a height ...
*June 7, 2013*

**Math**

1. One of the formulas for finding the partial sum of an arithmetic sequence is Sn = n(a1 + an) True 2. The value of a probability must be in the interval [0, 1]? True
*June 7, 2013*

**Math**

1. Determine the formula for the nth term of the following sequence: 6, 14, 22, 30, 38, 46, ... I got an = 8n - 2 Is that right? 2. The following statement is true by mathematical induction: (4/3)^n > n for all n > or equal to 6 True? 3. To find the 6th binomial ...
*June 7, 2013*

**Math**

Is the answer 336?
*June 7, 2013*

**Math**

1. Find the sum of the first 21 terms of the arithmetic sequence given by the formula an = n+5 I see that I have to plug in numbers and get the terms...but i'm sure there's a shorter way to do this instead of plugging in 21 numbers. 2. The following infinite geometric ...
*June 7, 2013*

**Math**

2. The range of a sequence is the set of positive integers. True?
*June 7, 2013*

**Math**

1. Find the area of the following triangle: c = 210 ft, A = 42.5 degrees, B = 71.4 degrees All I know is C will be 66.1 degrees...
*June 7, 2013*

**Math**

I need help with this question: 1. A hot air balloon is held at a constant altitude by 2 ropes that are anchored on the ground. One rope is 120 ft long and makes an angle of 65 with the ground. The other rope is 115 ft long. What is the distance between the points on the ...
*June 6, 2013*

**math**

Yes I got the formula and plugged the values in :)
*June 6, 2013*

**math**

I get 15.03 for the area...is that correct?
*June 6, 2013*

**math**

Gotcha!
*June 6, 2013*

**math**

I asked my teacher for answer choices for #2 and she said -root2/2, root2/2, or -root3/4... you said -1root2
*June 6, 2013*

**math**

area is 1/2bh...so can I make any side the base/height?
*June 6, 2013*

**math**

Can someone please check my answers and help me with the last question! 1. Solve sin2xcos2x = 4sin2x on the interval [0, 2pi] 0, pi, 2pi? 2. Exact value of sin(pi/12) - sin(5pi/12) root3/4? 3. Using factorial notation, 0! = 1 False? 4. Find the area of the following triangle. ...
*June 6, 2013*

**Math**

1. use the law of Sines to solve (if possible) the triangle for the value of c. A=27.5degrees, a=15cm, b=36.4cm 2. use the law of Sines to solve (if possible) the triangle for the value of c. B=52degrees, a=8cm, b=12cm How do I solve these type of problems?
*June 4, 2013*

**Math**

1. I think this one is true. I think the second one is False. I think you can make 2 triangles.
*June 3, 2013*

**Math**

1. The information in the following problem allows you to construct 1 triangle. A=30degrees, a=1m, b=2m 2. The information in the following problem allows you to construct 1 triangle. A=30degrees, a=.5m, b=2m 3. The information in the following problem allows you to construct ...
*June 3, 2013*

**Math**

1. Power reducing formulas can be used to rewrite 8sin^2 xcos^2 x as 1-cos4x. True or False? 2. Find the exact value of cos15 degrees using a suitable half angle formula. square root of 2+root3 / 2? 3. Find the exact value of cos^2(pi/8) using a suitable power reducing formula...
*June 3, 2013*

**Math**

Nevermind, I get it
*June 3, 2013*

**Math**

Okay, I understand 4 and 5. But what about 2 and 3?
*June 3, 2013*

**Math**

Can someone please check my answers! 2. Find value of cos(255degrees)cos(105degrees) root3 - 2 / 4 3. cos(pi/12) - cos(5pi/12) Is it root3/4? 4. Use the appropriate sum-to-product formula to rewrite the expression sin6x - sin9x I dont really understand how to do these, but I ...
*June 3, 2013*

**Math**

1. use the suitable product-to-sum formula to rewrite the following expression: sin(13x/2)sin(5x/2) 2. Find value of cos(255degrees)cos(105degrees) is it 1/4? 3. cos(pi/12) - cos(5pi/12) root3/4? 4. Use the appropriate sum-to-product formula to rewrite the expression sin6x - ...
*June 3, 2013*

**Math**

Thank you for your constant help! I appreciate it :)
*June 3, 2013*

**Math**

1. Find the exact value of 2tan pi/12 / 1-tan^2 pi/12 root 3/3? 2. Given tanθ = -1/3 and with θ in quadrant IV, find the exact value of cos2(θ) 4/5 3. Exact value of cos^2 67.5 - sin^2 67.5 root3 /2 4. The expression cos 3θ can be rewritten as 1 - 4cosθ...
*June 3, 2013*

**Math**

1. On the interval [0, 2pi] what are the solutions to the equation sin3xcos2x = -cos3xsin2x + 1? pi/10 and pi/2? 2. What is the value of tan75degrees? √(3) + 1)/(1 - √(3))? 3. Value of cos(130degrees)cos(130degrees) + sin(10degrees)sin(10degrees)? Not sure 4. On ...
*June 3, 2013*

**Math**

Can I please get some help on these questions: 1. How many solutions does the equation,2sin^2 2 θ = sin2θ have on the interval [0, 2pi]? 4? ...what about 4cos2θ = 8cos^2 2θ? 2. True or False: sin^2 4x = 1 has 8 solutions on the interval [0, 2pi]? False? 3. ...
*June 2, 2013*

**SAT math**

1. I just thought since prisms and cylinders both have 2 bases they might be considered the same...Unlike pyramids that have only 1 base.
*June 2, 2013*

**SAT math**

Can someone please double check my true and false answers! 1. All cylinders are prisms: TRUE 2. The angle opposite a side length of 6 cm in a triangle is larger than an angle opposite a side length of 7 cm in the same triangle: FALSE 3. The perpendicular bisector of the base ...
*June 2, 2013*

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