# Posts by John

Total # Posts: 8,380

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

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 ...

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

math
(1/7)^4

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?

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 ...

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.

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)

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.

Algebra 2
without the table or a good description... I can't help.

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

Geography
What are 3 types of zone?

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

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

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

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.

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...

History
i wish i knew

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

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

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

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

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

Management
low price

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?

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

algebra
150-(65+20g)

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.

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?

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 ...

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

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

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.

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

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. ...

Math
Thank you so much Bosnian!

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 :(

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...

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.

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

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

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

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

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

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

Math
7 x 3000 and 7 x 4000

Algebra
Tell us what you think and we will check it.

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

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.

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?

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...

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 ...

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

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

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

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

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

STATS
for anyone one question is .50

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

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

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.

Math
yes.

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

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

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

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.

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?

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.

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

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 ...

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 ...

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, ...

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

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

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.

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

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

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 ?

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

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.

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

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

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

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 ...

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.

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.

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

dosage calculations
Sorry wrong spot

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?

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.

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 ...

Statistics

Science
Thanks.

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

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

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 ...

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

Algebra
You have to decide which variable to eliminate. Lets choose x. We need the coefficients to be equal and opposite. I will multiply the first equation by 3 and the second equation by -5 15x + 12y =42 -15x -30y = -30 Add the two equations and the x will be eliminated. -18y = 12 y...

algebra 1
Divide both sides by 3 x-2 > -3 add two to both sides x> -1 The rules for inequalites are the same as for equations unless you are multiplying or dividing by a negative number.

Physics
A rocket accelerates upward at 3m/sec2 for 60 seconds when it releases a booster. How long will it take the booster to reach the ground from the highest point and what is its velocity as it is striking the ground? I'm unsure how to find the time if time is already given. I...

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