# Posts by JOHN

Total # Posts: 8,418

**Math-college**

You can't set each part equal to 7. That only works when you set each part equal to 0. Using zero works because we know if something times something = 0 then one of the factors has to = 0. multiply first x2 -x -12 <7 x2 -x - 19 <0 Now, you can finish the problem.

**maths**

This can be done with a Venn Diagram with two intersection circles. If 17% failed both.. that goes into the overlap. then 35% failed English and 31% failed math. Got this by subtracting the 17% from both given values. Now.. some 17, 35 and 31 and subtract that answer from 100...

**biology**

You have to know the volume to find the density. density = mass/volume

**Science**

Generation and conduction of postsynaptic potentials and Integration of postsynaptic potentials and generation of action potentials How can these two relate to football players? Your thoughts?

**Calculus**

Would dc/dx=0 when x is 1.16?

**Calculus**

A rectangular storage container with an open top is to have a volume of 10 . The length of its base is twice the width. Material for the base costs $12 per square meter. Material for the sides costs $5 per square meter. Find the cost of materials for the cheapest such container.

**algebra**

Jennny decided to open up her new coffee shop. Jenny needs to know how much he will need to bring in with the coffee shop to keep up with costs and revenue. With this problem, we have to make the problem into this: profit=the revenue- the cost of the buildings coffee they ...

**maths**

The height of cuboid is 4 cm and the volume of the cuboid is 60 cm^3.What is the area of the shaded face?

**math**

An apartment building has 15 apartments in it. The tenant association is having a hard time collecting the fees from the tenants with an 0.6 probability of a tenant paying their fees. What is the probability of tenant association collecting fees from 11 out of the tenants ? ...

**math**

An apartment building has 15 apartments in it. The tenant association is having a hard time collecting the fees from the tenants with an 0.6 probability of a tenant paying their fees. What is the probability of tenant association collecting fees from 11 out of the tenants ?

**science**

2 hydrogen = 2 g 1 Oxygen = 16 g 18 grams so you had 9 grams 9/18 = 1/2 is the proportion. This would be 1/2 of a mole of water. or are you asking the proportion by mass of H to O 2/16 = 1/8

**math**

In a college, 30 students are taking a math class and 20 students are taking an English class. 5 students are taking both English and math. How many students are taking either English or math.

**Math, algebra**

1. If $x <> (sqrt xy)/(|x-y|), find 4 <> (9 <> 1) to the nearest tenth. <>=diamond This is a function, where the "diamond" represents a function. 2. If f(x) = 3x^2 - 5, what is the value of f(f(-1))?

**Stats need help**

Use the empirical rule to solve the problem. The systolic blood pressure of 18 yr. old women is normally distributed with a mean of 120 mmHg (millimeters of Mercury) and a standard deviation of 14 mmHg. What is the percentage of 18 yr. old women that have a systolic blood ...

**Stats Help Help**

Find the variance for the given data. Round your answer to two decimal places. 5.0, 8.0, 4.9, 6.8, and 2.8

**Discrete or continuous help**

Identify the given random variable as being discrete or continuous. The number of stories in a specific Manhattan office building.

**STATISTICS**

Determine which of the four levels of measurement is most appropriate. Heights of survey respondents.

**STATISTICS**

A bag contains 5 purple marbles, 7 yellow marbles, and 3 orange marbles. If two marbles are selected from the bag: What is the probability that a yellow then an orange are chosen without replacement.

**RE: MathMate**

Ok thanks so I did answer the question correctly.

**math**

Consider the two inequalities 3x + 2y ? 4 9x + 8y ? 14 2y ? -3x + 4 2y/2 ? -3x/2 + 4/2 y ? -3x/2 + 4/2 y ? -3x/2 + 2 slope -3/2 y- intercept 2 The black line is y ? -3x/2 + 2 8y ? -9x + 14 8y/8 ? - 9x/8 + 14/8 y ? -9x/8 + 14/8 y ? - 9x/8 + 7/4 slope -9/8 y- intercept 7/4 The ...

**Algebra**

If x + (1/x) = a Find these in terms of a: x^2 + (1/x^2) and x^3 + (1/x^3) I got a^2 and a^3 as my answers, but the book says a^2 - 2 and a^3 - 3a. How did they get that?

**Algebra**

What I don't understand about this problem is that what the letters mean? I am sorry I forgot the + d at the end.

**Algebra**

Find a trigonometric equation in the form y = a sin (b (x-c)) which has a minimum of (3, -5) and a zero value of (6, -1). There is a graph with the minimum and the zero value labeled. It is wavy with suggests that it is a sin curve.

**Algebra**

Solve 3^2x+1 = 5(3^x) + 2 I would know how to solve it if it was only 3^2x+1, but now it seems more complicated.

**hookle's law**

50 N/25 cm = 100 N/?? cm 50 cm stretch + 20 cm = 70 cm

**math-probability**

To win first prize, he has a 1/500 chance to win first and 3rd. Assume he wins the first prize which is 1/500 then chance of winning 2nd is 1/499 and chance of winning 3rd is 1/498 to get to your ANDS multiply the two probabilities.

**Maths**

b.Find the seventeenth term of an Arithmetic Progression, whose 9th and 15th term are 19 and 37 respectively.

**statistics**

At one college, GPAs are normally distributed with a mean of 2.6 and a standard deviation of 0.6. What percentage of students at the college have a GPA between 2 and 3.2?

**Math - error NOT 2**

It said NOT 2; therefore, the product of 1/2 times 5/6 would be your answer

**Science**

Consider a lead-acid battery with 500 Ah capacity and a rated voltage of 12 V. a)What is the total capacity of energy in watt-hours that can be stored in the battery? b)Assume that the battery is completely empty. The battery is now charging at a C-rate of 0.20C. What is the ...

**politics**

I agree!!

**chemistry**

honey is more dense than ink.

**chemistry**

If temperature increases, rate of evaporation increases. If it is more humid, the rate of evaporation decreases.

**Social Studies**

I bet if you do a google search of the McCarran Act, you will find the answer very quickly.

**science**

Carbon, hydrogen, oxygen, nitrogen, sulphur, phosphorus, boron, chlorine, flourine, iodine etc. are the non-metals Sodium, potassium, magnesium, calcium, cobalt, manganese, iron, zinc, tin, molybdenum, vanadium etc. are the metals.

**Math**

Answer = 6 1176 = 2*2*7*7*(3*2) 1176 = 4 × 49 * (6) In above eqn, 4 and 49, both are perfect squares, but 6 isn't. So if we multiply 1176 by 6 (i.e. 1176 * 6 = 7056) we get 7056, which is a square of 84.

**science**

For every action there is an opposite and equal reaction. By adding Na2CO3 that will give you the CO3 which will push the reaction to form more CaCO3

**Math**

Multiply the two binomials. x^2 + 2x + 4x + 8 simplify from here and that will be your answer. area = l x w

**Math**

r = 4g r + g = 75 4g + g = 75 5g = 75 g=15 4g = 60 red.

**Civics**

I agree

**algebra**

-b +-sq root of b^2-4ac all of this divided by 2a 2 +- sq root (-2)^2 -4(1)(8) all divided by 2(1) 2 +- sq root 4-32 2+- sq root -28 all divided by 2 2+- 2i sq root of 7 comes from 4(-1)(7) all divided by 2 reduces to 1 +i sq rt 7, 1-i sq rt 7 are the roots. or are the values ...

**Algebra**

m = change in y/change in x m = (12-15)/(7-4) = -3/3= -1 Perpendicular lines have slopes that multiply to -1. If slope = 1/2 perpendicular = -2 In this case -1 perpendicular is 1.

**History**

I think it is D.

**Maths**

24/26 = 12/13

**Science**

The green revolution depended on A) new biodegradable pesticides. B) high-yielding grain varieties. C) clearing forest for crop land. D) organic fertilizers.***

**math science geography**

A resultant force of 15.00n acts on a body for 4s mass 4kg. calculate the change in momentum of the body within this period

**Math 6b**

The nu1/3mbers are 1 2 3 4 5 6 even numbers are 2 4 6 then it says not 2 4 6 is left which is 2/6 =

**Science**

How do global positioning systems use elevation points on Earths system to find latitude and longitude A. By using signals from a network of satellite B. By using topographic maps C. By using satellite images D. By using photography

**Science**

Do global positioning systems use elevation on Earths system to find latitude and longitude A. By using signals from a network of satellite B. By using topographic maps C. By using satellite images D. By using photography

**Physics**

speed = wavelength/frequency 340m/sec = 3m/ frequency can you finish from here? 3 times 340 with units of seconds.

**MATH**

2 happened 4 times 4 happened 9 times 6 happened 2 times 15/24 or 5/8 The theoretical probability would be 3/6 or 1/2 since half the numbers are even.

**stats help **

A scratch-card costs 5¤ and has two possible prizes. There is a 10% chance you get 5¤ back and a 1% chance you get 100¤. In all other cases, you get nothing. Let X denote your net winnings, i.e, (X = prize - cost). What are the expectation and standard ...

**statistics**

find n if c(n,3)=120

**Geography**

In which category should Atomic energy be placed, conventional source of energy or non conventional source of energy ? Please explain your answer ! Thanks

**Chemistry**

I need help balancing this acidic equation out with reduc/oxidation. Mn+2 (aq) + NaBiO3(s) -----> Bi+3(aq) + MnO4-1(aq)

**science**

I agree with B.

**Algebra 2 check **

The graph of y =1/x is vertically stretched by a factor of 3, re?ected across the y-axis and shifted to the left by 2 units. What is the function of the resulting graph? y=3/x-2 y=-3/x+2 y=1/3x-6 y=-1/3x+6 my answer is B

**Algebra 2 struggle**

How is the the graph of y=1/2x-6 obtained from the graph of y=1/x ? A) Vertically stretched by a factor of 2 and shifted right by 3 units. B) Vertically stretched by a factor of 3 and shifted right by 2 units. C) Horizontally stretched by a factor of 2 and shifted left by 3 ...

**science**

20 + 25 divided by 2 to find the average.

**physicccccccccccccc**

this is not the answer for my question,i think nobody knows my question

**physicccccccccccccc**

I did answered my question but not sure weather is correct or not 1)How is X-ray produced and why can it be used to help us see the structure inside the body? X-rays are produced when electrons strike a metal target. The electrons are liberated from the heated filament and ...

**Statistics**

There are 8 possible outcomes 2^3 Since you either have a head or a tail and 3 coins. 2/8 or 1/4 HHH or TTT 6/8 or 3/4 for the other choices. 1/4 times 5 - 3/4 times 3 -$1

**physic**

I need the answer for these 2 questions: 1)How is X-ray produced and why can it be used to help us see the structure inside the body? 2)Describe the process of X-Ray computerised tomography. What information does this process provide that ordinary X-ray images do not?

**History**

In the twentieth century the United States entered the world arena as an international power. What are some major points that led the United States to this position? What are some important events that I should know? Thanks

**Statistics**

In how many different ways can a chemistry book, a calculus book, a history book and a dictionary be arranged on a shelf so that the chemistry book or the history book appears first?

**Statistics**

a pair of dice is tossed. find the probability of getting a total of 8.

**Statistics**

3 bolts and 3 nuts are in a box. 2 parts are chosen at random. Find the probability that 1 is a bolt and 1 is a nut.

**Statistics**

In how many ways can 10 different books be divided among a, b and c so that 5 given to A, to 3 to B and 2 to C.

**physics**

a cart is moving horizontally along a straight line with constant speed of 30m/s.a projectile is fired from the moving cart in such a way that it will return to the cart has moved 80m.at what speed,relative to the cart and at what angle to the horizontal must the projectile be...

**Maths**

show that the circles x^2 + y^2 - 10x - 8y + 18 = 0 and x^2 + y^2 - 8x - 4y + 14x = 0 do not intersect.

**stats homework **

A scratch card cost €5 and has two possible prizes. There is a 10% chance you get €5 back and a 1% chance you get €100. in all other cases, you get nothing. what are the expectation and standard deviation?

**Math**

$12.79

**Math**

$1,279.20

**Math**

What will it cost to frame a picture in the shape of a regular hexagon 52 cm on a side if the framing costs $4.10 a meter?

**Algebra **

Through how many radians does the second hand of the clock turn between 7:15am and 11:20am

**MUSIC**

which style period would electronics have the strongest impact on? A)Classical B)Romantic C)Twentieth century D)Baroque

**physic**

A small fly wheel fitted to a motor with a moment of inertia of 80 kg m² slows down from 9000 rpm to 5500 rpm in 7.5 seconds. For the fly wheel, calculate: • The rate of deceleration which you can assume to be constant • The braking torque.

**Biology**

Which of the following statements regarding DNA and RNA is true? DNA can melt while RNA cannot. DNA is resistant to alkaline hydrolysis while RNA is not. DNA contains phosphodiester bonds while RNA does not. DNA can form double helices while RNA cannot.

**Biology**

Which of the following features of the structure of double-stranded DNA is most important in recognition of specific base sequences by most sequence–specific DNA-binding proteins? The greater depth of the minor groove. The arrangement of sequence-specific functional ...

**Stats**

let x be a binomial random variable with expected valuee 4 and variance 2 a) What is P(X=3)? b) What is P(X<6)?

**Business**

I agree with you.

**Maths**

Y + 1/3 Y = 28000 4/3 Y = 28000 Y = 28000(3) divided by 4 Is the price of the television set.

**Statistics/Math**

Try doing 1/x or maybe x^3

**Math**

Multiply by 5.

**math**

p = 52/218 q = 166/218 n = 218. Your test will be comparing your p-value with .301 to see if it is the same or different. Ho: p = .031 Ha: p does not = .301

**Math**

Simone has been flipping a coin and has just flipped 5 heads in a row. she says that because she has just gotten so many heads, she is more likely to get tails than heads the next time she flips. Is Simone correct? What is the probability that her next flip will be a tail? ...

**Math**

how many three letter security codes can be made from 4 letters A,B,C,D without using a letter twice? For example, BAC and A,D,B are two such codes. Explain

**Check My Math Answers Please!**

10) set the quadratic equal to zero and then use the quadratic equation to solve. x = -b +- square root of (b^2-4ac) all of that is divide by 2a 11) the height has to be zero when it hits the ground. Set the equation = 0 and use the quadratic to solve. However, since this is ...

**Check My Math Answers Please!**

First one is correct. The second one should be "d". You can check these answers by putting them into the original equation. You should get zero for an answer because "O" is when it hits the ground. For 5 & 6 use the square root of b^2 - 4ac. If you get a ...

**MATHS**

The largest area is always a square. 18 feet plus the 3 foot gate = 21 feet. He needs that evenly divided for 3 sides so I would 7 feet on each side. However, the problem is that they come in 3 foot sections. So you have to work this out so that you get as close to a square as...

**maths geometry**

The maximum area is always a square. Divide the 2km/3 since they only need it for 3 sides. 2/3km on each side.

**math**

A worker was paid $218 for each day he worked and was fined $36 each day he was absent. at the end of 30 days he earned $5524. how many days he was absent?

**math**

Find the 10th term in an AP where the first term is 3 and whose 1st, 4th and 13th terms form a GP.

**MAth**

If you pay $950,000 for a car and its value depreciates 10% per year. how much will be its worth 5 years from now?

**Math**

cara uses 2/3 of a cup of almonds to make 4 cups of trail mix. how many cups of almonds would she use to make 9 cups of trail mix

**Math**

890

**MAth**

In a set of five consecutive positive even integers, the ratio of the greatest integer to least integer is 2 is to 1. If these integers are arranged from lowest to highest, which is the middle integer in the list?

**math**

The sum of the first 5 terms of a GP is 61. If the 5th term is 81 solve the value of the common ratio.

**chemistry**

In the predicted electron configuration of Molybdenum (Mo), how many electrons are in the 4d subshell? 2. How many electrons are in the 4d subshell of the Molybdenum (III) ion?

**math**

A pipe is cut into twp pieces. One piece has a length of 33 inches. If the other piece has a lenght of u inches, what was the total lenght of the pipe, in inches, before cut?