# Posts by john

Total # Posts: 8,380

Math
To reach the ground, the height would be zero. 0 = -5t^2 + 35t - 2 You need to use the quadratic equation to solve for t, because this is not factorable. b) Time up = time down c) -b/2a will give you the max. height. -35/-10 = 3.5 meters -

4 red out of a total of 16 4/16 of a red You replace the red so you still have 16 7/16 chance of a blue AND means both events have to happen to you multiply the two fractions. 2) there is no replacement. Getting the same is the same as in #1 But... getting the blue is now 7/15...

a) the number of pink divided by the total number of pink and brown. b) the number of brown divided by the total number of pink and brown.

math help me asap
12! means 12 factorial that means 12 times 11 times 10 times 9 times 8 times 7 times 6 times 5 times 4 times 3 times 2 times 1. 4! is 4 times 3 times 2 times 1 8! is 8 times 7 times......all the way down to 1. Most people do this math using a calculator with a factorial key. ...

Math
x = -6 and x = 3 so x+6 = 0 and x -3 =0 (x+6)(x-3) = 0 0 = x^2 +3x -18 This will open up. 0 = -x^2 - 3x +18 This will open down. You can set this equal to y now. If you work backwards. Factor out the negative 1, factor the trinomial, you will can solve it and find the roots of...

math
the problem says the roof rises that is the 8 over a distance of 12 8/12

math
The is the same as the one I just answered, but with different numbers. Can you do it? rise/run.

math
pitch is rise divided by run 6/27 reduce this answer.

1) It is 1/3 of 90 2) 8! divided by 5! 3) is a combination 12! divide by (4!8!) 4) I agree with you 5) I agree with you.

Math
Since both = y, they must = each other x^2 + 2x = 3x + 20 x^2 -x -20 = 0 Now, factor: (x-5)(x+4) = 0 Can you find the values of x?

Math
Honor calculus students.. I think it would be skewed. More higher scores than lower scores. I don't think there would be much variation. What do you think?

1) I agree 2) 8/43 times 12/43 3) I am not sure what the question is asking. There is a weird symbol. 4) no replacement 5/14 times 3/13

Math
(19 + 21 + 22 + 28 + 18 + x) divided by 6 = 27 multiply both sides by 6 19 + 21 + 22 + 28 + x = 27(6) Now solve for x.

Math
I just did this one or one like it a few minutes ago. Please look for that post.

math
Sounds like the 46 is the diameter of the circle. area = pi times r-squared area = 3.14 times (23)squared or area = 22/7 times (23) squared

math
I would think that most of the heights would be very, very tall with a few shorter. The tail would be on the left with data clumped to the right. If the tail is on the left, it is skewed to the left. Do you agree?

Math
3/8 times 1/.03 = amount of vanilla in millimeters.

7th Math
1.5 x .946 x 7 every 3 days would get you 7 times in 21 days.

jiskha
It is free and everyone here volunteers their time.

health
You need to relax and think. What gets rid of body wastes? Would it be muscles? Do you know what cardiovascular is? How about excretory? I bet these words are in your texbook or else search them on the web. Come back with your answer and someone will check it.

145.16 rounded to the nearest hundredth.

90 miles times 1/.62 miles will give you the number of kilometers. so.. you are dividing .62 into 90 This will also be your miles per hour because the question is per hour to begin with.

math
5 times .75 = how much you need. Subtract 2.5 from your answer to see how many more cups you need.

Math
We can't see the video for 84

Math
kilograms/pound 200/440 you want to divide 440 into 200 pounds/kilogram 440/200 divide 200 into 440. You do not just reduce fractions to lowest terms because the question asks for unit rates. This means you need a "1" in the denominator.

math
200 words/minute

math
word per minute is a unit rate 1000/5 reduced will give you your unit rate.

Math
I think of combinations of co-captains. ( combinations starts with (co) Suppose there are 10 people on a team, how many ways can you choose co-captains. Remember since they are equal Joe and Sam are the same as Sam and Joe. For permutations.. think about a President and vice-...

MATH
I will do the first row 37 38 39 Can you do the rest?

Math
5 times 4 = 20

Math
8^2 - 8/2 64 - 4 = 60 writing 60 in primes 2 times 2 times 3 times 5

Science
I think so.

Math
.55x = 2 x = 2/.55 or 200/55 = 40/11 That is correct if your teacher wants the answer as an improper fraction otherwise 3 7/11

Math
6 7.5 8 23 32.5 The median because the data is skewed. Look at the difference between 7.5 and 8 is only .5 Difference between 8 and 23 is 15 To use the mean, you want the difference between the median and Q1 and Q3 to be about the same. Otherwise use the median.

Math
hours would be between 0 and 24. Would you want integers - that would include hours only and no parts of hours. Would you want real numbers that would include 1.5 hours, 1.25 hours, etc.

Math
Use a VENN diagram here. 15% like none 45% - overlap like literature 70% - overlap like music These are supposed to add up to 100% The add up to 130 which means that 30% would be in the overlap of liking both .30 x = 60 x = 200 x = 400

algebra
y= mx + b there is no b so b = 0 You will start your graph at (0,0) m = -1.5 means that the graph will slant downward from left to right -1.5 = -3/2 or 3/-2 you can move down -3 and to the right 2 or up 3 and to the left 2 to start your graph. Follow this pattern. x has to = 2...

Geometry
1. A point on the ceiling of a room is 12ft. from each of the vertices of a triangle on the floor whose legs are 6ft. A and 8ft. respectively. find the length of the ceiling. 2. With a 12ft. pole marked in feet, how can one determine the foot of the perpendicular let fall to ...

Geography
Without seeing the PPT, but just reading the sentence. Increase population decrease. Does this make sense to you?

MATHS (PROBABILITY)
45/200=.225 not satisfied (p-hat) 155/200=.775 satisfied(q -hat) Standard dev. The square root of (.225)(.775)/200 Margin of error = z-score times the sd 95% that leaves 5% with 2.5% in each tail or .025 which gives us a z-score from the table or from the calculator of 1.96 1....

Cape he loped high school
You sell lemonade for \$2 and orange juice for \$3. You sell 100 cups for \$240. How many cups of lemonade and how many cups of orange juice were sold

Alerbra/Math
I need help on this question. The supplement or an angle is 18° less than the measurement of the angle

ELA
how does the author reveals the theme of the drummer boy of shiloh

math
Cyndee wants to invest \$50,000. Her financial planner advises her to invest in three types of accounts: one paying 3%, one paying 5 1/2%, and one paying 6% simple interest per year. Cyndee wants to put twice as much in the lowest-yielding, least-risky account as in the highest...

algebra
A miniature-doll collector has a total of 254 unique dolls. The collector can afford to add 3 unique dolls a week to the collection. Which algebraic expression represents the number of unique pieces the collector has at the end of w weeks?

b - because she starts with 200 and spends x dollars + sales tax .06x x + 0.6x = 1.06x Subtract what you spent with tax. 1.06x from the 200.

Algebra
x + y = 12 x - y = 4 Add the two equations together to eliminate the y. 2x = 16 x = 8 so y = 4 Check these values in the original equations.

Stastics
correct

math
Richard because a 16 x 16 grid has more squares than a 10 x 10 grid. 1/4 of a larger number gives us a larger number. They each shade a different number because 1/4 of 10x10 is a different number than 1/4 of 16 x 16.

math

Length of similar shapes
I answered this below just a few minutes ago.

Math
I wrote tan of 30 instead of tan 31 If you use tan 31, you should get 1338.

Math
Tangent = opp/adj tan 31 = x/2227 find tan 30 degrees and multiply that answer by 2227.

math
Use t and substitute into the equation. D = 5 + 5(0) = 5 D = 5 +5(1) = 10 etc.

How about the time it takes Joe to complete some task. He takes more time that Steve. 8 times 3 minutes less than .. can you do the problem now?

Math
m = 5k because every value in M is 5 times as big as the value in K. To help you do others like this problem divide each K into each M to see if you get the same value.

math
take away means to subtract. we will subtract 30 from j j - 30 or j minus 30

maths
Are you adding and rounding? 3 1/5 + 1 + 2/5 = 4 3/5 since 3/5 = .6, I would round to 5.

Math
16 more than a number divided by 4 16 + n/4 Antoine is correct. Zach's would be the sum of 16 and n divided by 4.

length of similar shapes
If they are similar then there sides are all in the same proporiton. 25/10 = 2.5 the ratio is 2.5 4cm long times 2.5 = 10 How would you find the width 7cm times ___ = ____

chemistry
25(.5) = 25(x)

Math
On your graph on the x-axis, you will have time 1, 2, 3, 4, On your y-axis put the miles d = 20t

Math
t = 19+ 15 L I think your teacher will want the 19 included in the total time. If not, then t = 15L

Stastics
I believe it is n-2 when doing a two sample t.

Stastics
I agree with c.

Itt tech
All you do is substitute -3 for x. 5(-3) + 8 = 0

Stastics
The 99% confidence interval is wider than the 95%. If something is in the 99% then it has to be in the 95% interval Since it seems that a and d would be correct, it makes me think that your teacher is trying to show you that confidence intervals can always be different because...

stastics
for t to get larger you will need the numerator of the problem to get larger and the denominator to get smaller. The formula has the difference between the means divided by the standard deviation. I would say d. The standard deviation decreases and the difference between the ...

Statistics
9% more Do you want to do a two sample test to see if 41% is statistically greater than 32%. If so, we need more information.

Math
rectangular area for cattle and uses a straight portion of a river as one side of the​ rectangle, as illustrated in the figure. Note that there is no fence along the river. If the farmer has 16001600 feet of​ fence, find the dimensions for the rectangular area that...

counseling
Don't see the choices.

Algebra
1-3 are correct. I don't see the x in #4 You would chose your x, so the value on the radical sign would never be negative. It would have to be > or equal to zero. If your question is square root of (3 +3x) then you want this expression to be equal to or greater than ...

Stastics
I agree with your confidence interval. Nice work. Since .80 isn't within the interval, you are correct to say no as the answer to that question. random variable p should be the percent or proportion of student who drive.

Lisa Richter deposited \$5,000 at 4% compounded semiannually for three years. At the beginning of the fourth year, Lisa deposited \$2,500. What would her balance be at the end of five years assuming she is still earning 4% compounded semiannually?

Trigonometry
Right triangle tan of 38 = x/125 Find the tan of 38 and multiply by 125 to get your answer.

Math
12 because 12 divides into both 36 and 12 If you were asked to factor,the answer would be: 12(3x+y)

Chemistry
At equilibrium at 1.0 L vessel contains 22.00 mol of H2, 20.00 mol of CO2, 13.00 mol of H2O, and 5.700 mol of CO at 427◦C. CO2(g) + H2(g) ⇀↽ CO(g) + H2O(g) What is the value of K at this temperature for the reaction?

math
Question 1 To make the confidence interval, you need to find the mean and the standard deviation for the data. Since this is a small sample and you don't know the population standard deviation, you will use "t" instead of "z". Using a t-table you will ...

LA
There is no passage.

math HELP
can't see the graph.

stat
50-60/20 = -.5 z score Look that up to find the % You want z<-.5 10-60/20 30-60/20 -2.5 and -1.5 are the z-scores find the % by finding -2.5<z<-1.5 Can you submit your answers so they can be checked.

math
y = 25+10x or y = 10x+25 y = 18 + 15x or y = 15x + 18 Here are you two equations. to solve by substitution 10x + 25 = 15x + 18 Solve for y and then find x.

Dosage calculations
Thank you!

Dosage calculations
1000 mL has been infused in 8 hours at 150 ml/hr. After 3 hours, how many have been infused? 1000/8 = 125 ml 125 x 3 =375ml? Therefore after 3 hours 375ml has been infused Is this correct?

Chemistry
We did an experiment where we had to figure out the amount of water molecules in CuSO4xH2O (x being the value to find). If the stirring rod used was wet and was used to stir the beaker would this result in a higher x value? Is this a experimental or human error. Obviously this...

Physics
a 2x10^-6 point charge travels a distance of.002m between two parallel charged plates from the negative end toward the positive end. The field has a strength of 500 N/C What is the change in voltage?

child development
the continues development views hold that

Physics
An electric field measured near a point charge of 3.0 X 10^-6 C has a strength of 1.50 X 10^5 N/C How far is the point from the source charge

Health
The lungs are? A. Connected by the mediastinum B. Separated by the mediastinum C. Divided into 7 lobes D. Divided into 9 lobes C?

Physics
If one charge (+5 uC) is placed at origin and a second charge of (+7 uC) at x = 100 cm, then where can a third charge be placed and of what size, so that it has no electrostatic force on it. I know the magnitude of the force will not matter, however, I'm not sure as to how...

chemestry
0.63g of pb powder were disolved in excces nitrate(v) aci to forn leadnitrate solution, all the lead nitrate solution were reacted with sulphate,give the ion equationof the reaction between lead nitrate and sadium sulphate solution?determine the mass of the lead salt formed in...

calcus
water partially fills a hemispherical bowl of radius 40cm so that the depth of the water is 20 cms. write down an integral representing the volume of the water in the bowl

Weight - 20 pounds 6 ounces Ordered dose - 1.5mg per kilogram per day recommended dosage from drug label - 3mg every 8 hours. 1.What is the individual dose? to find the individual dose i'll first convert pounds to kg which is 9.26 kg. I will then multiply 1.5 x 9.26 = 13....

What is the maximum dose client could have? I would multiply the weight x the recommended dose which equals to 863.5 mL.

Nurse orders 375mL every 8 hours, client weighs 38 pounds. Recommended dose is 50ml 1. pounds to kg -> 17.27 kg 2. individual dose is 17.27 x 375 = 6476.25 mL 3. Daily dose is 6476.25 x 3 because 24 hours divided by 8 = 3. therefore the daily dose is 19,428.75 mg. Is this ...