# 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

**math - business**

Thank you!!

**math - business**

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 ...

**math - business**

Thank you both!

**math - business**

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.

**math - business**

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.