# Posts by john

Total # Posts: 8,288

**Statistics**

A confidence interval is found by adding and subtracting the margin of error. If we take the difference of 235.1 and 197.2 and divide by 2 we have the margin of error. this margin of error is found by taking 1.96 times the standard deviation. To find the standard deviation ...

*October 15, 2016*

**Math**

Do you mean something like (10-2) x 25 = 250 -50 = 200 then 200 (20-3) 4000 - 600 = 3600

*October 14, 2016*

**Statistics**

0 because if all scores are 80 the mean is 80 and all values are 80 so there is no spread in the data.

*October 14, 2016*

**Statistics**

a) a 30 instead of a 3 gives us more variability in the data.

*October 14, 2016*

**Physics**

An automobile leaves the store, first going south at 88 km/h for 2 hours, and then turns on a road heading 20 degrees east of north at 55 km/h for 1.5 hours. Calculate the (x,y) components of the net displacement of the automobile from the starting position, where the x-axis ...

*October 13, 2016*

**Math**

65t -50t =97.5 15t = 97.5 divide by 15 to find time in hours

*October 13, 2016*

**math**

(1/7)^4

*October 12, 2016*

**math**

This is a right triangle. The legs are (x+20)1 and 1x (x+20)^2 +x^2 = 450^2 2x^2 +40x + 400 = 202500 2(x^2+20 x + 200) =202500 x^2 + 20x + 200 =101250 x^2 + 20x -101050 = 0 Can you finish from here?

*October 12, 2016*

**algebra**

The line has a slope of 3 because y = mx+b where m is the slope. Perpendicular lines have slopes that are negative reciprocals. So we have a 3 which makes our perp line's slope -1/3 If you multiply the two slopes you will always get a -1 if the lines are perpendicular If ...

*October 12, 2016*

**Math**

Scientific notation always leaves one number to the left of the decimal .62 x 10 ^2 move the decimal point 1 place to the right to get 6.2 and now the exponent becomes 1.

*October 12, 2016*

**Geometry**

(3, 5) (5, -11) (x, y) 5 -3 = 2 so the x value should be 2 more than the midpoint (2,y) -11-5 = -16 difference so we need a difference of -16 from the -11 (2,-27)

*October 12, 2016*

**Algebra 2**

We have to see the table. I do know that a probability is always between 0 and 1. It looks like the only possible answer is 2/3. That is just a guess.

*October 12, 2016*

**Algebra 2**

without the table or a good description... I can't help.

*October 12, 2016*

**Maths**

1000 = k5^3 1000 = 125k 1000/125 = k k = 8 64 = 8 q^3 8 = q^3 q = 2

*October 12, 2016*

**Geography**

What are 3 types of zone?

*October 12, 2016*

**Math**

Where would I put parentheses to make this true? 7-3x4+6=27

*October 11, 2016*

**Science**

What is a bird speed flying at 12 m/s with a crosswind at 20 m/s

*October 10, 2016*

**Math**

each person gets 1/3 of the kites since there are 3 kites, each person gets 1 kite.

*October 10, 2016*

**Statistics**

I believe the E-4 is tell you to move the decimal point 4 places to the left. .000812 is less than .01 Remember all probabilities will be between 0 and 1.

*October 10, 2016*

**spanish 2**

Please fill in the blanks with the correct spanish form of the word in pernethesis!!!! Help Hoy yo______(ir) a un guateque campesino. ______ (ser) un ________ (event) especial en Cuba. Hay mucha _________ (food) y _________ (music). Yo _______ (estar) muy ___________ (excited...

*October 10, 2016*

**History**

i wish i knew

*October 10, 2016*

**Statistics**

Suppose systolic blood pressure (the higher of the two blood pressure readings) of a large group of individuals is normally distributed. If the mean is 122 and the standard deviation is 20, then

*October 9, 2016*

**algebra**

(x-1)/6 = 1/3 3x-3 = 6 3x = 9 x = 3

*October 9, 2016*

**Math**

16 + 7 = 23 oz. the other piece ways 12 oz.

*October 9, 2016*

**PLEASE HELP ME**

It is the median and it is not misleading. The $23.50 is an outlier. find the middle of the data it falls between 9 and 9.50

*October 9, 2016*

**math**

Whenever you multiply or divide across an inequality by a negative number, you change the direction. Think about 2 > -4 Multiply both sides by a -3 -6 > 12 NO... change the inequality -6<12

*October 9, 2016*

**Management**

low price

*October 9, 2016*

**Management**

If time is running out to finish the operational-planning process before the start of the new fiscal year, it should be cut short with the resolve to start earlier the next year. true or false?

*October 9, 2016*

**Mathematics Help**

35 females + 11 males who got a C 46/64 =

*October 8, 2016*

**algebra**

150-(65+20g)

*October 8, 2016*

**maths**

15(35.75)+16(42.25) = James total 25(35.75)+10(42.25) = Sally's total 18(35.75) + 13(42.25) = Andres Find the amounts then subtract the smallest from the largest.

*October 8, 2016*

**Math**

What is the standard form of five and three hundred fifty-two thousandths? 1: 5.0032 2: 5,352,000 3: 5.352 4: 5.30052000 Is it two?

*October 8, 2016*

**maths**

4, 6,7, 8 in the ten thousands 0,1,2,4,6,7,8 can be used in the thousands hundreds and tens could use any of the digits ones would have to be 0,2,4,6,8 if we can repeat the digits then 4 times 7 times 7 times 7 times 5 The only problem is that we don't want to have 40000 ...

*October 8, 2016*

**math**

A = lw 96 = (w+4)(w) w^2 + 4w -96 = 0 (w +12 )(w-8) =0 w=-12 cannot have a neg value here w = 8 so l = 12

*October 8, 2016*

**Math**

Jai = julia + 2/5 julia I am not sure what you mean by the next sentence.

*October 8, 2016*

**Math**

P = B+12 (P-1) = 3(B-1) P-1 =3B-3 substitute for P using first equation B+12-1 =3B -3 14 = 2B B = 7 P = 19 last year they were 6 and 18.

*October 8, 2016*

**STATISTICS**

true positive happens 96% of the time. Multiply .006 times .96 false positive .006 times .04 add the two together.

*October 7, 2016*

**Statistics**

c) When you create a 99% confidence interval this indicates that If you made many intervals by taking samples of the same size from a population then...99% of all of the intervals that you make will contain the true population mean. It would not contain 99% of the population. ...

*October 7, 2016*

**Math**

Thank you so much Bosnian!

*October 7, 2016*

**Math**

Find the product and explain the process and reasoning 0.67 x 0.3 Please help I don't know how I could explain this :(

*October 7, 2016*

**Engineering/Physics**

When gasoline is burned in the cylinder of an engine, it creates a high pressure that pushes on the piston. If the pressure is 150 pound-force per square inch, and it moves the 3-inch diameter piston a distance of 6 centimeters in 0.1 seconds...

*October 5, 2016*

**Physics**

Briefly describe the relative quantities of kinetic, gravitational potential and mechanical energy as a stone is thrown in the air vertically upward and falls to the person's hand at the same height that it left.

*October 4, 2016*

**math**

r/b = 3/5 5r = 3b 20 + r = b 5r = 3(20 + r) 5r = 60 + 3r 2r = 60 r = 30 b = 50 ratio is 30/50 or 3/5

*October 4, 2016*

**Chemistry**

Base = NaOH, 0.084 M drips 2ml at a time Acid = Phenol, KA=1.3*10^-10 You have 28.0 ml in flask, and it is 0.06 M How would you find the molarity and moles of OC6H5-1

*October 3, 2016*

**Math**

x + x +1 = -11 2x = -12 x = -6 x = -5 product = 30

*October 3, 2016*

**Math**

That means that you have to multiply 11 times itself 2016 times. You would need to use a calculator with 11 ^ 16.

*October 3, 2016*

**Algebra**

distance = rate x time 5 + 40x = 50x 5 = 10x x = 1/2 hr

*October 3, 2016*

**math**

F = 4J F+J>= 55 4J + J >= 55 5J >= 55 J = 11

*October 3, 2016*

**Math**

7 x 3000 and 7 x 4000

*October 3, 2016*

**Algebra**

Tell us what you think and we will check it.

*October 3, 2016*

**MATH**

The forty and the 9th term of an AP is -3 and 12 respectively. Find the common difference and some of the frist 7th term

*October 3, 2016*

**Chemistry**

An Unknown Compound (M=60.09 g/mol) is composed of Carbon, Hydrogen and Oxygen. Combustion of 0.255 g of the unknown compound produces 0.561 g Carbon Dioxide and 0.306 g of Water. Determine the molecular formula of the compound.

*October 3, 2016*

**math**

2) The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?

*October 2, 2016*

**psychology**

According to a survey in the U.S. in the 1990s, people in their 40s reported more lifetime sex partners than did people in their 50s. Which of these is the most likely explanation? a) People in their 50s were starting to lose their memory. b) People in their 40s had been young...

*October 1, 2016*

**psychology**

According to Hans Selye, stress is a) a specific response to a specific demand on the body. b) a cognitive, not physical, response to a threatening situation. c) any reaction that increases activity in the parasympathetic nervous system. d) a nonspecific response of the body ...

*October 1, 2016*

**psychology**

According to Abraham Maslow, what do we do when we have several motivations? A) We alternate between one and the other. B) We try to satisfy them at the same time. C) We are frozen with indecision. D) We start with the lowest need and work up. D Is my answer

*October 1, 2016*

**math**

john hiked 8 1/3 miles in 3 3/4 hours. what was John's average speed for the hike

*September 30, 2016*

**Math**

(3/4)pg/1 min = 3 pg/x cross multiply 3 = 3/4 x x = 4

*September 29, 2016*

**Stats,**

Put the values in order from lowest to highest. 25th percentile will have 1/4 of the data below that number. 90th will have .9 of the data below that nu

*September 29, 2016*

**Algebra**

7 more than 5 times a number is 10. Replace "a number" with something from the real world.

*September 29, 2016*

**STATS**

for anyone one question is .50

*September 29, 2016*

**math**

In a pet store there are 12 kittens for sale and 80 puppies. what is the ratioof the number of puppies to kittens ? write your answer as a fraction and reduce your result . thank you

*September 29, 2016*

**English**

I checked 1-9 and I agree with all of them except for the first one.

*September 28, 2016*

**math**

a^2 + b^2 = c^2 x^2 + 11^2 = 12^2 x^2 +121 =144 x^2 = 23 take the sq rt of 23 to find your answer.

*September 28, 2016*

**Math**

yes.

*September 28, 2016*

**Algebra**

Graph y = -|x -5| Make it a dotted line because the original problem is less than not less than or equal to. Let x=0 y=-5 x = 5 y = 0 x = 4 y = -1 shade

*September 27, 2016*

**adv algebra**

x/5 -3 = x/4 -2 x/5 -x/4 = 1 4x/20 -5x/20 = 1 -x/20 = 1 -x = 20 x = -20

*September 27, 2016*

**science**

Density = mass/volume 56/22 = If the answer is greater than 1 ..the density of water then it will sink.

*September 27, 2016*

**Math**

8 orange/12 selzer or 2/3 divide each part of the fraction by 3 to get per 1 cup of selzer. 2/3 over 3/3 or 2/3 for 1.

*September 27, 2016*

**Math**

A wire of length 24 meter is to be folded in the form of a rectangle. If each side of a rectangle has to be an integer (measured in meters), what is the maximum number of rectangles that can be formed by folding the wire?

*September 27, 2016*

**Algebra**

Pick any two points (0, 17.5) and (3, 35.4) Find the slope (35.4-17.5)/(3-0) 17.9/3=5.96666 or 5.97 y = mx+b 17.5 = b since x=0 y = 5.97x + 17.5 replace x with 15 and find y.

*September 27, 2016*

**Algebra**

Do this one the same way that I did the other one. (5,80) and (12,85)

*September 27, 2016*

**statistics**

An outlier is a value that is much larger than the rest or much smaller than the rest. range is the difference between the largest and the smalleest value. mean = add them all and divide by 30 mode is the value that occurs more than once. median. put all of the data in order ...

*September 27, 2016*

**math**

6200-6300 divided by 400 to get the z-score. Then use the z-table to find the probability of less than you z-score or you could use a stat calculator like at TI-83 or 84 to find the probability. For forty days you have to use 400 divided by the square root of 40 as the ...

*September 26, 2016*

**Statistic**

A recent poll conducted by Gallup Inc. asked the following question: In general, how much trust and confidence to you have in the mass media - such as newspapers, TV, and radio - when it comes to reporting the news fully, accurately, and fairly? A great deal, a fair amount, ...

*September 26, 2016*

**Math**

a ratio is when you put one number over another so I would say the ratio of 3 and 6 would be 3/6 which equals 1/2

*September 26, 2016*

**math**

x + x+2 <= 7+(x+4+x+6)/2 2x+2<= 7+x +5 Can you finish from here?

*September 26, 2016*

**math**

A quick way would be to multiply 1 1/2 times 8 which would give you 12 lbs. So..all you need is 12 lbs and you have 14 4/5. you have enough.

*September 26, 2016*

**Math**

It depends on what the graph looks like or the units that you are using.

*September 26, 2016*

**Math**

You are okay until the 8+8 step 8-8 = 0 5 - 16 =-11

*September 26, 2016*

**Ap Chemistry**

Saccharin has a pKa of 2.32 It has a formula of HNC7H4SO3 If you dissolve 4.6 grams of saccharin in 478 ml of water, what is the resulting pH ?

*September 25, 2016*

**English Check My Answer**

Try saying the sentence aloud with the words in each one. Only one of them makes sense in both.

*September 25, 2016*

**English Check My Answer**

Which word from the following list has meanings that fit both sentences? I’ll start the fire after _______ a match. The workers are ______ for a higher wage. A. Protesting B. Lighting C. Fighting D. Striking A is my choice.

*September 25, 2016*

**Math**

This is a right triangle (BD)^2 = 7^2+8^2 (DC)^2 = 16^2 +8^2 Can you finish from here??

*September 24, 2016*

**Maths**

A= 2R A-800=R-240 2R -800 = R -240 R = 560 A = 1120

*September 24, 2016*

**Algebra**

Multiply the second equation by -4 an add to the first equation. 4x - 6y = 10 -4x-4y= 0 -10y=10 y=-1 find x

*September 24, 2016*

**chemistry**

In a large building, oil is used in a steam boiler heating system. The combustion of 1.0 lb of oil provides 2.2×107J. Part A How many kilograms of oil are needed to heat 110 kg of water from 24 ∘C to 100∘C? (Assume that 1lb=454g, the specific heat of liquid ...

*September 23, 2016*

**University South Carolina**

$9000 + $3x =12x solve for x and that will give you the break-even point. One more person will give you the profit.

*September 23, 2016*

**math**

This works just like an equation. Divide both sides by 3. The only difference is if you had -3x<18 you would divide both sides by -3 . Dividing or multiplying by a negative number means you have to switch the direction of the inequality.

*September 23, 2016*

**5th grade math**

insert in parentheses: 14+2=6+2x3+2

*September 23, 2016*

**dosage calculations**

Sorry wrong spot

*September 23, 2016*

**Cmax e exponent **

How do I solve for Cmax= 8.5/ e(-0.257 * (1-0.5))? Also, how would I input 'e' in my calculator?

*September 23, 2016*

**Math**

Not a. You have to multiply the coefficients - the numbers and you add your exponents. Also,the correct answer only has one number to the left of the decimal point. The answer for the first one is d. I agree with your answer for the last one. Retry the other 2.

*September 22, 2016*

**Math**

You have to make table of the sample space 1,1 1,2 1,3 ... 1,6 2,1...............2,6 3,1................3,6 4,1 5,1 6,1 You should have 36 entries. Given the sum is greater than 3 will eliminate 1,1 1,2 and 2,1 So you are working with 33 possibilities for the denominator The ...

*September 22, 2016*

**Statistics**

Try adding one.

*September 22, 2016*

**Science**

Thanks.

*September 20, 2016*

**Science**

A group of parts that work together is called. A. Technology B. Process. C. System. D. Feedback I think its C?

*September 20, 2016*

**Algebra**

John earns $3 more than hugh. Leslie earns $2 less than twice Hugh. Together they earn $101. How much does Hugh earn?

*September 20, 2016*

**Chemistry**

10. Use the accepted Ksp value of Calcium hydroxide to calculate the following: a. What is the most calcium hydroxide that can be dissolved in 1.0 Liters of de-ionized water? b. What is the most calcium hydroxide that can be dissolved in 125.0 ml of de-ionized water? c. What ...

*September 20, 2016*

**Commom Core Algebra**

Factor out the common x + 2 (x+2)(x+3) Once you factor out(x+2) what is left is just x +3

*September 19, 2016*