# Posts by john

Total # Posts: 8,599

Physics
A device that can alter the resistance in a circuit is known as a: a. switch b. potentiometer c. circuit breaker d. ammeter

math(mechanics static)
Three identical sphere with the same size and same weight. A 100N sphere is placed at th top of the 3 spheres. Find the contact force between the 3 spheres & the 100N sphere.

life orientation
Four aspects when choosing subjects

Math
the answer is 23 confirmed.

Physics
a speeding car is driving at 120 km/h when it passes a police cruiser that is driving at 100 km/h. One second later, the police cruiser accelerates uniformly at 15 km/h until it reaches a speed of 135 km/h. how long does it take the police cruiser to catch the car

Math
Convert 9 pounds 6 ounces into Kg.

Math
How to solve this problem? Here is what I have done so far. question --> 12(1/2)% x (1/2)/(3/4) First i solved the fractions (1/2) x (4/3) =4/6 I changed the 12(1/2)% into a decimal by solving 1/2, which is .5 which equals to 12.5 Answer is 1/12 but I have no idea how it ...

math
log(3) 9 = 2 The 3 that I put in ( ) should be lowered to a subscript.

math
This is similar to one I answered yesterday. between 0 and 5 inclusive the function = 2 between 5 exclusive and 10 inclusive function = 11-t between 10 exclusive and 14 inclusive function = 7 The cheapest would be 2 so that would be Nov. 7 and 8. c(12) used last one 7 c(5) use...

algebra
x = amount at 12% y = amount at 8% x + y = 12000 .12x +.08y = 1240 multiply by 100 to clear decimals 12x + 8y = 124000 -8x -8y = -96000 4x = 28000 x = 7000 y = 5000

Pre-algebra
I agree.

Math
Please what are the steps to solving this problem? I am stuck. question= 12 1/2% x (1/2)/(3/4) 12(1/2)% = 12.5 (1/2) x (4/3) 4/6 = 2/3 I don't know what to do next.

MATH.
y = x^9 times 5 + 6 trade the letters x = y^9 times 5 +6 Solve for y (x-6)/5 = y^9 take the 9th root of each side the 9th root of (x-6)/5

math
46 and 76 other means you add them together. 23/61

Math
You need a circle here. x^2 + y^2 = r^2 x^2 + y^2 = 100

Math
It is 27/161 161 dispensed of which 27 were white so that means 27 of the 161.

Math
The same as we have been doing in early questions. Can you tell me how you would set this up?

Math
We need more information to answer this question. 5/8 b + 5/9 g +48 =????

math
80 times 356 60 times 275 45 times 369 Add the answers you get for each multiplication and you will have your answer That should give you your answer.

Math
I think you want to give your brother 1/3 of what is left over right? You need the 3/4 for your shelf. If that is the case. 3/4 of 8 = 6 you take 6' for yourself and there is 2 feet left over and you will give your brother 2/3 ft. If it means that you give your brother 1/3...

math
12/4 = 3 so we have 12 1/4 cups plus the extra 1/4 cup gives us 13 1/4 cups.

Math
55 shows 45 were sold out 45/55 simplify.

Common core standard. math
W = 5/6 L A = L times W A = l times 5/6 L 360 = 5/6 times L squared 360 times 6/5 = L squared Multiply 360 times 6 divide that answer by 5. Now take the square root to find L.

Math
Yes.

Math
pentagon has 5 equal sides. Divide 16 by 5 to get your answer.

Math
It looks like the cheapest time would be between Oct. 20th and Oct. 23rd. c(9) would be 8 c(2) would be 3 The difference is 5.

math
77 trains and 55 were full 55/77 or 5/7 would be the probability written as a fraction.

Math
3 and 7/8 would be between 3 and 4, but closer to 4. You have to see if the ruler is marked in 8th or something else. If it is marked with 8ths, then count out 7 from the 3.

Math
I just did this below.

math
3.64 -3.25 divide by 3.25

Math
(x -3)(3 2/5) = 15 3/10 (x-3) (17/5) = 153/10 (x-3) = (153/10)(5/17) x-3 = 153/34 x-3 = 4 1/2 x = 7 1/2

Algebra 2 b
30 + x + x = 100 30 + 2x =100 2x = 70 x= 35

math
the slope you need the change in y divided by the change in x. -2 - 0 divided by 3 - (-1) -2/4 = -1/2 so I agree with you. y = -1/2 x + b you can choose either point and put in the x and y and solve for b. 0 = -1/2(-1) + b 0 = 1/2 + b -1/2 = b This is odd, but it can happen y...

math
And so we will multiply the two probabilities green even 3/6 or 1/2 white greater than 2 4/6 or 2/3 probability is 1/2 times 2/3 = 2/6 or 1/3 or as a decimal .333

MATH
Nina = sam + 4 (Nina +1) = (Sam +1) +3 Sam + 4 + 1 = Sam + 4 5 = 4 for a final answer which is a false statement; therefore there is no solution. Something is wrong with the problem as written.

database
what is InnoDB

engineering
an overview of MyISAM and InnoDB

prt 305
factors that affect location decisions

electrical technology
A battery of 9 V charges a capacitor of 47 ìF through a resistor. What resistor value needs to be used to obtain a voltage across the capacitor of 8 V when 10 seconds have elapsed ? You will need to obtain the standard equation for the voltage across the capacitor ...

math
54 to 96 reading the first number as the stem and the other numbers as the leafs. the range is the difference between those 2 numbers.

precalc
2 log(3x+1) = 3 log(x-2) Get this step by using the law of logs regarding exponents. log(3x +1) /log (x-2) = 3/2 log (3x + 1 -x +2) = 3/2 log (2x + 3) = 3/2 can you finish from here?

Math
Could it be?? 171 this number has 1 hundred 7 tens and 1 one. or many, many other choices.

math
Get a common denominator of 35 2/5 times 7/7 = 14/35 2/7 times 5/5 = 10/35 He uses 24/35 what is left.. subtract from 1 or 35/35

Statistics
Find the z-score 72-69 divided by 2.8 = 1.07 for a z-score. What percent are over 6 feet tall, so we want the right tail. You can use a z-table to find the value. Unfortunately, not all z-tables are constructed the same way. If you have a TI-83 or 84 calculator, you can use ...

algebra 1
It is difficult to work with a negative coefficient of x^2. Factor out the -8 (-8)(2x^2 - 12x - 25) (-8)(2x + 5)(x -5)

algebra 1
One method is that it looks like a perfect square since the first and last terms are perfect squares. (2x+3)^2 However, if you do the check you will get 12x for the middle term and not 16x. So.. that method doesn't work. another method would be the guess method (2x )(2x ) ...

Math
Here you need to use the law of logs. Anything that is added will be multiplied, anything that is subtracted will be divided, anything that is multiplied will be taken to a power. log(base5) (8/2)(15/2)^3 divided by 81/8 Simplify this first and then continue.

math
The board is 7 feet which is 84 inches. Do you have a typo regarding that length or the 99 inches?

statics
To make both: .6 times .6 = .36 Make at least one of two: 1st 2nd make .6 make .6 miss .4 miss .4 make .3 miss .7 Makes at least one means one or two made (.6)(.6) + (.6)(.4) + (.4)(.3 multiply and sum and you should get your answer.

stats
n = (z times sigma divided by E)^2 n = (1.96)(1.2)/.05 = 15.68 now square 245.8 or 246

maths
Multiply by 4 to get your answer.

math
Divide 4.35 by .05 to get the number of nickels. Then relate that back to the problem. Do you need to add or subtract 5 nickels to get the answer?

Geometry
You want to compare length to length and width to width to make your ratio. 10/4 = x/6 cross multiply: 60 = 4x x = 15 Check the answer to see if you get the same ratio 10/15 is that the same as 4/6 Yes.. they both reduce to 2/3.

Math
You would pay 28% which means you will be able to keep 72% (100-28) You will then have 72% of 7% or .72 times .07 will give the correct answers. (1-.28)(.07) is the specific formula. Can you come up with a general formula?

math
From these numbers it seems that 3/12 would be broken so that is 1/4 or 25%. Multiply 3000 times .25 to find out how many might be broken.

Statistics
Ho: null hypothesis Ha: alternative hypothesis When you do a test, if you p-value is small enough than you can reject the null hypothesis which means there is not enough evidence to support the null. If the p-value is large than you fail to reject the null You are usually ...

math
A confectioner has 300 pounds of a chocolate that is 1 part cocoa butter to 7 parts caramel. How much chocolate that is 1 part cocoa butter to 15 parts caramel should be combined with the first in order to create a new chocolate that is 1 part cocoa butter to 9 parts caramel? ...

World Geography
How has the region attempted to change its future so that they will be less dependent on oil wealth in the coming decades? A. By improving education B. By increasing government control in the economy C. By ceasing to export oil to other parts of the world D. By shifting their ...

World Geography
Which religious group is found in the western parts of Eastern Europe? A. Roman Catholics B. Eastern Orthodox C. Muslims D. Protestants I put B but that was incorrect

Math
one can of concentrate to four cans water makes juice. If I have 24 cans of juice, how many cans of water did I use

physics
determine the thrust produced if 1.5 x 10^3 kg of gas exits the combustion chamber each second, with a speed of 4.00 x 10^3 m/s

Math
Not sue why Ms Sue answered 6/10 when the question is, how old is Eli?

Math
If 12 cookies sell for 4.80 cents, then how much money would it be for 20 cookies?

Calculus help, very confused!!
I'm working on the same problem, any chance you could help me through the second derivative test section?

physics
a 55 kg satellite is in circular orbit earth with an orbital radius of 7.4 x 10^6 m . determine the satellite’s a)kinetic energy b)gravitational potential energy c)total energy d)binding energy

physics
an object is hung from a vertical spring, extending it by 24cm.if the spring constant is 35 N/m, what is the potential energy of the stretched spring ?

Life orientation
Do you know what xenophobia is?

medical Terminology
I agree.

Math
amount times 6% = 59.00 .06 x = 59 divide 59 by .06 to get the answer.

Math
Are you talking about the diameter being 15 in? If so: C = pi times d C = 3.14 times 15 If you were talking about a radius, then you have to double the radius to get the diameter.

Math
calories per hour burned depends on the persons weight and the rate they are riding the bicycle. You could start the function rule there.

Statistics
If they say at least one, it is easier to do the question by finding NONE and subtracting that number from 1. At least one would mean, 1, 2 or 3. I agree with a and b. for c, take 1- .001 = .999

stat
.72 times .72 times .72

Probability! Check please!
7!/4!3! 7* 6* 5 * 4* 3 *2 *1 divided by 4*3* 2* 1* 3*2*1 You can cancel like factors 7(6)5) divided by (3)2 = 35

math
62 -40-40 = Can you finish from here?

Math
150 cm /10 cm = x/2000 cm cross multiply to get x 10x = (150)(2000) divide by 10 to find answer in cm. change to meters by dividing by 100.

Math
Yes, equilateral means all sides are equal

statistics please help!
Based on what I did for the other two can you figure out this one? What is your answer?

statistics please help!
That neither ring Probability that A does not ring is .7 Probability that B does not ring is .8 Multiply the two.

statistics please help!
Both is an "and" Multiply the two probabilities .3 times .2

Math that needs an answer in the next 5-10 min!!!
yes you are right.

Math that needs an answer in the next 5-10 min!!!
What is side AB?

STATISTIC
Two tailed means that you would have .05 in each tail. To reject the null you have to be farther out in the tails than the .05 which actually gives you a smaller p-value because you have less area. Your value needs to be less that .05.

Maths
Find an expression for dy/dx y^3+(1/y)=x^2-7y

MATH
I don't see the choice, but to find 8 equal sections divide 13 by 8.

algebra
log 100 + log y - 3log z this is the law of logs.

Math
x +x(2.40) = normal cost of the shoes This is the cost plus 240% Simplify: x(1+2.40) 3.40x if it is 25% off, you are paying 75% of that price. .75(3.40)x = 39.95 x = 15.67 Check it by 15.67 + 2.40(15.67) to get 53.27 Then during the sale you are paying 75% of the price which ...

Math
Let x = # of \$50 bills Let y = # of \$10 bills x = 4+y 50x + 10y = 380 substitute 4 + y for x 50(4+y) + 10y = 380 200 + 50y + 10y = 380 Solve for y to find # of 10 dollar bills.

algebra
x + y = 27000 .02x + .03 y = 800 Interest = amount times rate times time Usually people multiply by 100 to get rid of the decimals. x + y = 27000 2x + 3y = 80000 Multiply the first equation by -2 -2x-2y =-54000 2x + 3y = 80000 add the two equations together to solve for y ...

accounting
You are a merchandiser that buys wild widgets from a vendor for \$70 each, marks them up, and sells them for \$100 each. Journalize the three transactions below.You use the perpetual inventory system and reduce inventory when it is sold. You sell 80 wild widgets to a customer on...

ed tech
what is the purpose of rules? A.To provide an agreed upon list of acceptable and unacceptable behavior.* B.to discourage creativity C.to prevent students from having fun D.to provide time limits for computer use.

Math/dosage
A 7(1/2)% strength solution has been prepared. a) How many grams of medication are in the 7(1/2)% strength solution how do I setup this question? Is this correct? 7(1/2)/100 = x/100mL

Math
There are 60 balls, 17 are red and the rest are black. If I draw 7 balls what's the probability that at least 3 are red?

Math
y = (4/9) x y = (900/10) x or y = 90x y = mx + b where m = slope = change in y divided by the change in x. Time would always be on the x axis.

Math
Look at the difference 3 9 27 81 first term = 1 First term plus 3 3^1 = 4 second term plus 9 3^2 = 13 third term plus 27 3^3 fourth term plus 81 3^4 Can you write an expression for this. If you let term # = n

Math
You divide 2 into 30 and find that it is a factor of 15. Multiply 1 times 15 and 5 times 15 so 15:30:75 To check your work divide each part by 15 and you should be back to the 1:2:5

Math
There aren't any numbers that will work. If the 12 was positive It would factor to 4 and 3 There will not be any x-intercepts since it isn't factorable. I don't know if you have worked with imaginary solutions, but that is what you would have here.

math
3/5 is the same as 6/10 Since you had 5ths and wanted 10ths Divide to find the factor of 2. Then multiply the top(numerator) and the bottom (denominator) of the fraction by 2/2 to get the 6/10.

Pre-algebra
Order of operations You normally work left to right However: You do any multiplication or dividing before adding or subtracting. 19 - 8 + 5 11 + 5 16