# Posts by John

Total # Posts: 8,394

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

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
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

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

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

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

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

Maths
Perimeter = 2L + 2W 192 = 2L + 2W W = 2/3 L 192 = 2L + 2 (2/3)L 192 = 2L + 4/3 L 192 = 6/3 L + 4/3 L 192 = 10/3 L Multiply each side by 3/10 to find the Length then substitute that answer into the original equation to find the width.

education
The meaning of the "oxymoron" is a. dummy b. farty c. self-contradictory phrase d. single e. shadow around a flame

education
in your opinion, Is vygotsky or Piaget theory is more relevant to the issues facing the modern classroom?

Math
In a bag of 400 jelly beans, 25% of the jelly beans are red in color. If you randomly pick a jelly bean from the bag, what is the probability that the jelly bean picked is NOT one of red jelly beans?

physics
A hockey puck is hit on a frozen lake and starts moving with a speed of 14.0 m/s. Five seconds later, its speed is 5.50 m/s. (a) What is its average acceleration? m/s2 (b) What is the average value of the coefficient of kinetic friction between puck and ice? (c) How far does ...

physics
for a) i got -1.70m/s^2 b) i need help c) i got 48.8m so can anyone help me with What is the average value of the coefficient of kinetic friction between puck and ice?

physics
A hockey puck is hit on a frozen lake and starts moving with a speed of 14.0 m/s. Five seconds later, its speed is 5.50 m/s. (a) What is its average acceleration? m/s2 (b) What is the average value of the coefficient of kinetic friction between puck and ice? (c) How far does ...

physics
A box rests on the back of a truck. The coefficient of static friction between box and bed of the truck is 0.355. (a) When the truck accelerates forward, what force accelerates the box? the inertial force centripetal force the friction force gravity (b) Find the maximum ...

physics
A 4.00 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal, as in the figure below. The block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinetic friction between block and ...

Survey Of Calc
The cost C (in dollars) for producing x units of an item is given by C=370+2.55sqrtX. find the marginal cost when the production level is X=400 units. My answer came out to 51/800, or .06375. I'm not sure if I did it correctly.

physics
A 3.00-kg block starts from rest at the top of a 31.0° incline and slides 2.00 m down the incline in 1.40 s. (a) Find the acceleration of the block. m/s2 (b) Find the coefficient of kinetic friction between the block and the incline. (c) Find the frictional force acting on...

physics
A block of mass m = 5.4 kg is pulled up a θ = 24° incline as in the figure with a force of magnitude F = 35 N. (a) Find the acceleration of the block if the incline is frictionless. m/s2 (b) Find the acceleration of the block if the coefficient of kinetic friction ...

Calculus
Messed this up on my last question. Given the table below for selected values of f(x), use 6 trapezoids to estimate the value of ∫f(x)dx where a=1 b=10 x 1 3 4 6 7 9 10 f(x) 4 8 6 10 10 12 16

Calculus
Given the table below for selected values of f(x), use 6 trapezoids to estimate the value of x 1 3 4 6 7 9 10 f(x) 4 8 6 10 10 12 16

Math
If a certain square measures 2.5 feet on one side what is the area of the square and square inches

Math
So Peter is 11 and Veronica is 13?

Math
Veronica is 2 years old than her brother Peter. The sum of their ages is 24. How old is Veronica, and how old is Peter?

science
What do you think?

Help on math!
Very good. I agree with all of your answers. You have a good understanding of probability with and without replacement.

Math
First find how far he hiked on Friday. You need a common denominator first 15 4/12 2 9/12 When you subtract these fractions, you will need to borrow one from the 15 and write the 1 as 12/12 14 16/12 ( 2 9/12 Subtract to get 12 7/12 Add this mixed number to how far you walked ...

Algebra
27000 is equal to 2.7 x 10^4 Multiply 6 times 2.7 = 16.2 Multiply 10^5 times 10^4 = 10^9 (when multiplying, keep the base and add exponents) 16.2 x 10^9 this is not the proper form we need only 1 number to the left of the decimal 1.62 x 10^10

science
It has to do with the amount of water in the pool. It is so much larger, it takes longer to heat up.

Calculus
dy/dx=x/(x-4) I.will have a slope field with negative slopes in quadrant I II.will have a slope field with positive slopes in all quadrants III.will produce a slope field with columns of parallel tangents

If diagonals bisect each other then it is true that you have a parallelogram.

Calculus
A differential equation that is a function of x only a.will produce a slope field with parallel tangents along the diagonal b.will produce a slope field that does not have rows or columns of parallel tangents c.will produce a slope field with rows of parallel tangents d.will ...

Math
Independent variable is the hours h If this was graphed it would be on the x-axis. Dependent variable changes based on what happens with the indep. variable. money earned increases as hours works increases.

maths
8 8 2/3 9 1/3 10 10-8 = 2 divided by 3 2/3

math
The first term of an arithmetic sequence is 2.The 12th term in the progression is 9 times bigger than the 2nd term. Find the common difference d.

Math
For a given right triangle side a=76.4 feet and side b=39.3 What is the length of side c to the nearest tenth of a foot?

Calculus
Find the specific solution of the differential equation dy/dx= 4y/x^2 with condition y(-4) = e.

Calculus
The particular solution of the differential equation dy/dt=y/4 for which y(0) = 20 is y = 20e^-0.25t y = 19 + e^0.25t y = 20 e^0.25t y = 20^e4t

Calculus
Sorry this is really long. Just wondering how I would do each of these A particle is moving with velocity v(t) = t^2 – 9t + 18 with distance, s measured in meters, left or right of zero, and t measured in seconds, with t between 0 and 8 seconds inclusive. The position at ...

Calculus
Are you sure that's how you would do that? Because its not one of my options. my options are 1.25, 6, 0.50 or cannot be determined.

Calculus
An elementary student kicks a ball straight into the air with a velocity of 16 feet/sec. If acceleration due to gravity is -32 ft/sec^2, how many seconds after it leaves his foot will it take the ball to reach its highest point? Assume the position at time t = 0 is 0 feet.

quant chemistry
A standard solution of Mn2+ was prepared by dissolving 0.250 g of Mn in 10 mL of concentrated HNO3 (measured with a graduated cylinder). The resulting solution was quantitatively transferred to a 100 mL volumetric flask and diluted to volume with distilled water. A 10 mL ...

Algebra
Suppose a circle is centered at the vertex (0,0) and has a radius of length 4. For which points on the circle is the x-coordinate equal to 1? Your first answer should have a positive y-value. For which points on the circle is the x-coordinate equal to 3? Your first answer ...

Math
Tom is less than 10 years old. He is one half as old as Chris. In 8 years, Tom will be three-fourths as old as Chris. How old is Tom?

Math
Thank you, but can you please explain how you got that? I am confused.

Math
(〖3x〗^4/〖6x〗^3 )2 I'm having some trouble solving this. In the numerator is 3x to the 4th. In the denominator is 6x to the 3rd. All of that is in a bracket and it's all squared. Do I have to first subtract the exponents, 4 - 3 and then ...

math
Thank you.

math
What does indeterminate form mean exactly? Does it just mean that you can't determine an answer?

social studies
B C A If You Go To Connexus

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