# Posts by carly

Total # Posts: 316

math
Why is -4^2 -16, not 16? To me, -4 * -4 = 16 because a negative times a negative equals a positive. I understand -(4)^2 being negative but not without the parentheses. Thank you.

Math
We are learning about linear and exponential growth and simple and compound interest. How do I know if I use .02 if my growth rate is 2% or if I use 1.02? What is the difference if I have the 1 in front? I'm a little confused about that. Thank you.

Chemistry
How many moles of magnesium nitride form when 1.0 mole of magnesium reacts completely?

math
no, ok thanks i have one more question... Consider a billion-sided regular polygon that is circumscribed around a circle of radius r; how are its area and perimeter related?

math
why would it be expected though?

math
the weird ie thing is supposed to be pi

math
The area of a circle of radius r is Ï€r^2, which happens to be 1/2r times the circumference 2Ï€r. Explain why this relationship should be expected.

Health
1. In a soccer game, the coach of the home team realizes her players are not as highly skilled as the other team and she wishes to avoid a high scoring game which she believes her team will not win. How can she apply coaching tactics to give her team the best chance of winning...

Health
You too :)

Health
thank you

Health
At the mall, John and three of his friends are waiting for the movie to start. One of his friends has an older brother who says he can get them all into the movie for free if they go around to the back of the building and come in through the employee entrance when the manager ...

math
Thank you.

math
The air pressure at sea level is generally about 1013 hPa (hectoPascals). For every kilometer that you go up in elevation, the air pressure decreases by 12%. Write an equation that describes the air pressure when the elevation is x kilmoeters above the sea level. The answer is...

Math
Steve, thank you, but what do you mean constant 2nd differences? And constant ratio over equal intervals? For me, the difference between linear and exponential is that linear go up/down at a constant amount by adding that same constant amount. Exponential goes up/down by ...

Math
Considering linear, quadratic, and exponential lines of best fit: If you're studying a set of data, how can you decide which of those three types of model would be most appropriate for the data?

math
A manufacturer has determined that if it sets the price of paper at x dollars per ream, then its monthly profit can be represented by the equation P = (6000 - 400x)(x - 2). Determine the y-intercept and explain what it means. The teacher said that the y-intercept is (0, -12,...

math
Find the initial amount given an exponential function. Given the equation y = 24(0.77)^t, what is the initial amount? To find the initial amount, I need to replace t with 0. When I do that, I get y = 24(0.77)^0 which is y = 24(1), so y = 24 In doing other problems, that first ...

Math
The producer of a 30 minute tv documentary about world war 1 divided it into two parts. four times as much program time was devoted to the causes of the war as to the outcome. how long is each part of the documentary?

math
Yes, I understand what intercepts are, but I don't understand HOW the solutions to my equation are the first coordinates of my x intercepts. Am I thinking too much about this?

math
What is the connection between the solutions of the equation ax^2 + bx + c = 0 and the x intercepts of the graph of f(x) = ax^2 + bx + c? The solution says: The solutions of the equation are the first coordinates of the x intercepts. I did the solutions to the formula but do ...

science
tom is marking the locations of active volcanoes on a world map. how the locations of the volcanoes are related to earths plats.

Math
Solving system of equations by substitution. 52. {5x-2/4+1/2=3y+2/2;7y+3/3=x/2+7/3

Thank you!!

A manufacturer has determined that if it sets the price of paper at x dollars per ream, then its monthly profit can be represented by the equation P = (6000 - 400x)(x - 2). Determine the y-intercept - I multiplied it out and found that the y-intercept was (0, -12,000) Then it ...

Thank you both!

Steve, Thank you - this makes sense that the highest profit is at the vertex, but where is the x = =b/2a from, and where is the 4/.01 = 400 from? I'm having trouble connecting those numbers. Thanks for clarifying for me.

My profit formula is P = -.005x^2 + 4x - 200. The question wants me to find the number of donuts sold (what they are talking about in the problem) that will generate the highest profit. How do I determine that? Thank you.

math
Hi, I'm trying to learn factoring but a couple of things don't make sense to me and I'm hoping you could explain them. If I have P(x) = 2(x-3)(x-4), how do I automatically know that the zeros are x = 3 and x =4? If inside the parentheses it was (x+3)(x+4), would ...

math
I'm sorry, but I am asking this question again because the response I received was a question that I could not answer - that's why I am asking here. Thank you. If someone asked: what can we learn from analyzing the standard deviation of a set of data that we couldn'...

math
If someone asked: what can we learn from analyzing the standard deviation of a set of data that we couldn't learn from just looking at the measures of average, how would I answer? I know that average is the value or number in the middle of the data set and standard ...

math
Z, thanks, however, in my first question, how do I find d in that equation?

math
The number of days, d, it takes for a construction crew to repave a certain road varies inversely as the number of workers, w, that work on the project. So my equation is d = k/w If w = 16, how do I find d? d = k/16 Also, why is Y = 2x^2 + 3?x not a quadratic equation? It'...

MATH
The answer book says that this one is NOT a quadratic equation. It looks like y = 2x^2 + 3 and then what you typed - I'm not able to type that. Isn't that three times the square root of x?

MATH
Thank you, Reiny, however, why wouldn't my second example, y = 2x^2 + 3 times the square root of x be a quadratic equation since the highest power would be 2?

MATH
Hi, I'm trying to understand what a quadratic equation is. I understand that in a quadratic equation you have to have a variable in the second power. Why, then, aren't y = x^2 + 2x^3 and Y = 2x^2 + 3 times the square root of x quadratic equations? They both have powers...

math
We are learning about the empirical rule - is that the same thing as the bell curve?

math
When a situation can be modeled by a linear equation, what information do you need in order to find an equation?

MATH HELP
Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the earth in ...

math
I'm really struggling with the concept of direct variation and indirect variation. Is there an easy way to explain it and understand it?

math
I need to come up with some ideas of things that have interesting linear relationships. I understand that a linear relationship is something that has a straight line, so is growing or declining at a constant amount every time period, or mile, or whatever, but what would be an ...

math
Hi, When I'm making a graph, how do I know what scale to use? I often struggle with this. Does the origin always have to start at 0? But then I don't know what intervals to use. Is there a rule of thumb? I'm referring to things like scatter plots and charts. Thank ...

math
When you are solving inequalities, when does the sign change and when does it not? For example, in -4x -5 > 8 I know I add 5 to both sides, then I have -4x > 13 Divide both sides by -4 and it becomes x < -3.25 But WHY does the direction of the sign change? In 9x + 6 &...

math
If the Red Sox have 14 fans, the Pirates have 42 fans, and the Phillies have 25 fans, what is the probability that a randomly selected fan is not a Red Sox fan? The total number of fans is 81, so I believe it would be 42 + 25 = 67/81 which is 82.7%. However, the answer says it...

english
some spectators in the back row of the rodeo jeered at the clowns after the last event.

Math - Excel
Hi, I need to write an Excel formula and I am trying to double check my work. We are asked to find the difference and relative difference for this account. So the values are: \$10,000 \$10,700 \$11,400 \$12,100 \$12,800 \$13,500 etc. The difference for each is \$700 I have two ways ...

math
Thank you, Steve. The question does actually also ask us to put it into inches, so I'm thinking to do that I would divide by 12 since there are 12 inches in a foot? Would that be correct?

math
hello, I am to calculate a model length of a boat and a car. The boat's true length is 17 feet and the car's true length is 20 feet. The model will be on a 1:16 scale. Could you tell me how I get started with this please?

Math
If each small square on a grand chest board is 2 cm x 2 cm and the diagonal on the whole board measures square root of 800 cm. How many small squares are on the board?

math
Could you please explain why, when increasing something, you put a 1 in front of it? For example, if something is increased by 5%, why do you multiply by 1.05? What exactly does that 1 mean or represent? Thank you.

math
thank you

math
Steve, I'm not sure what you mean by a "scaled-up" triangle. And where did you get the 10-24-26? Also, if you use those coordinates and the distance formula, you don't get 26 miles.

math
A lawyer drives from her home, located 6 miles east and 10 miles north of the town courthouse, to her office, located 4 miles west and 14 miles south of the courthouse. Find the distance between the lawyer's home and her office. I know the answer is 26 miles but I cannot ...

math/stats
A hamburger chain found that 65% of all customers use mustard, when they buy hamburgers. If 5 customers randomly selected, what is the probability that none use mustard?

algebra
if you toss a coin and roll a number cube, what is the probability that the coin shows tails and the number cube shows 4?

chemistry
I don't understand the difference between endothermic and exothermic?

chemistry
Ok thank you

chemistry
And no its not multiple choice

chemistry
Well I think 0.5x 6.02x10to the 23rd/27.0gAl × 3.5gCuCl2 x 1molCuCl2/ 170.5g CuCl2 =? But I'm not sure at all?

Math
Thank you.

Math
Find all points on the x-axis of a Cartesian coordinate system that are 20 units from the point (0,12) The point (0,12) would just be 12 points up on the y axis, so wouldn't I just count 20 spaces to the left and right so it would be (20, 12) and (-20, 12)?

math
How would I go about solving this problem? (-6x^6)(-6x^2x^6)

Math
It's called math literacy. There are pictures but they don't help. They are just squares in a straight line, in a l shape, a t shape, and a plus sign

Math
I'm really struggling with this -- I have different table configurations - straight line, L-shaped, plus sign-shaped, and T-shaped. Suppose there are n tables arranged in these patterns. I need to write an expression of the number of tables with 2 chairs. Our teacher gave ...

Math
I think I was looking at it as the two parentheses were multiplied together but I see now! Thank you. What about the first question?

Math
1. Use the associative property to rewrite the expression 97 + (3 + 13) I rewrote this as (97 + 3) + 13 since the associative property is about changing the grouping. The answer in the back of the book says 97 + (3 + 13) -- the same as the original problem. 2. Use the ...

math
When determining the slope of a line, what is the correct way to leave the answer? For example, my problem is: Find the slope of the line passing through (-7,9) and (5, -7) After subtracting the y's and the x's,I know the slope is -4/3, but do I leave the answer like ...

Math
We are adding positive and negative numbers. The question is State positive or negative or it depends along with my answers. Are these correct? Positive + positive: positive Positive + negative: it depends Negative + negative: negative Positive – negative: positive ...

Math
1. What is the distance between the points (1, 4) and (4, 8)? I said Distance = 5 2. Find the slope between (1, 4) and (4, 8) I said 4/3 3. Are the expressions (4x+4)/4 and x+1 equivalent? I said Yes 4. Simplify (x+y)2 x2 + 2xy + y2 5. Is (x – y )2 = x2 – y2? No. It...

Health
thank you

Math
You have a total of 21 pens and pencils. You have 3 more pens than pencils. Write a system of linear equations that represent this situation. How many of each do you have?

physics
if you use a horizontal force of 30 N to slide a 12 kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor?

physics
Block A (Mass = 2.319 kg) and Block B (Mass = 1.870 kg) are attached by a massless string as shown in the diagram. Block A sits on a horizontal tabletop. There is friction between the surface and Block A. The string passes over (you guessed it) a frictionless, massless pulley...

physics
A 3.90 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=14.1N at an angle theta=32.5degrees above the horizontal, as shown. a.) What is the magnitude of the acceleration of the block when the force is applied? b.) What is the ...

Physics
Three blocks are located on a horizontal frictionless table. They are connected by a massless cord, as shown in the figure, and pulled to the right. The masses of the three blocks are m1 = 38 kg, m2 = 37 kg, and m3 = 17 kg. a.) The pulling force is equal to T3 = 45 N. What is ...

Math
A pilot test requires 3 out of 5 students to be tested if there are 930 kids, how many will have to take the test? Please help! Thank you

LA
oh ok i get it thank you

LA
Essay Questions? i think Essay questions are for when you have to write or type something in your own word it that correct

LA
what are essay question i always get them on my test but i do not know what they are

L A/The Giver
a a d c

P.E.
thank you?

P.E.
thank you

P.E.
thank you

Health and Physical
thank you

Science
thanks

science
thanks anonymous

Physics
The space shuttle is in a 3e+5 m high orbit over the earth. The radius of the earth is 6.37e+6 m, the mass of the earth is 5.98e+24 kg. What is the distance from the center of the earth to the space shuttle? I don't know whether I would double the radius and the add the ...

Physics
Musicians can use beats to tune their instruments. One flute is properly tuned and plays the musical note A at exactly 440Hz. A second player sounds the same note and hears that her flute is slightly "flat" (that is, at too low of a frequency). Playing at the same ...

Physics
1) F=ma a=(mh*g)/(7/5ms+1/2md+mh) 2) same answer as 1 because it is a system 3)a=alpha*R alpha=a/Rd (use a from 1) 4) similar to 3 alpha=a/Rs 5)F=ma T=ms*a T=7/5ms*a (a from 1) 6)T=mh(g-a) 7)d=1/2at^2 (position formula - starting position and velocity are zero) t=sqrt(2d/a) (...

Physics
12

science
Find the mass of potassium chloride and volume of oxygen at STP liberated when 0.5 moles of potassium chlorate are heated.Also find the moles and mass of oxygen evolved.

physics
I weigh 130 pounds, so how much would I weight on a neutron star?

Social Studies
banana is right I got 9/9

science
thanks

Chemistry
A column of mercury in a barometer is 767.3 mm Hg high. Note, that in order for the pressures to be equal, density and height of a column are inversely proportional, therefore, (den1)(h1)=(den2)(h2). The density of mercury is 13.6 g/mL and the density of water is 1.00g/mL. a) ...

Math
704 ft

Physics
A 2050 kg truck is traveling east through an intersection at 2.3 m/s when it is hit simultaneously from the side and the rear. (Some people have all the luck!) One car is a 1200 kg compact traveling north at 4.5 m/s. The other is a 1600 kg midsize traveling east at 10 m/s. The...

bobpursley
yes it is

physics
Three blocks on a frictionless surface are connected by massless strings, with M1 = 1.40 kg, M2 = 2.40 kg, and M3 = 3.60 kg. Due to the force F acting on M3, as shown, the system accelerates to the right. Given that T1 is 3.50 N, calculate T2

Math
A rectangular enclosure is to be constructed with 800 feet of fence in order to have four sections. What should be the dimensions in order to maximize the area enclosed? What is the maximum area?

Math. Explanation Needed
You know that 60✖️10=600 and so you know that 621➗59 is going to be more than 10.

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