# Posts by John

Total # Posts: 8,338

**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

**Math PLEASE!**

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?

**Physics**

A bug is on the rim of a 78 rev/min, 12 in. diameter record. The record moves from rest to its final angular speed in 3.29 s. Find the bug’s centripetal acceleration 1.5 s after the bug starts from rest. (1 in = 2.54 cm). Answer in units of m/s^2 .

**Algebra**

If $560,000 is 94% of (x) what is x

**Math**

1. Fill in the blank: Correlation does not _______ causation. A. cause B. imply C. beat D. run

**Physics**

A bug rides on a turntable which is rotating at 3 rad/s. The moto is turned off, and the bug covers 36 radians before coming to rest. a. What is the angular acceleration of the bug? b. How long does it take the bug to stop?

**physics**

When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 916 N and the drag force has a magnitude of 1050 N. The mass of the sky ...

**chemistry**

. In the following reaction: Fe2O3 + 3C → 2Fe + 3CO; how many grams of C are needed to react with 16.5 g Fe2O3?

**math**

Thank you.

**math**

What is -(-(-8)) I believe it's -8 because of the double negative if you work inside the parentheses first?

**Geometry**

Thank you - I have to turn it in online.

**Geometry**

Do you know how I would be able to draw figures on the computer to practice calculating perimeter and area? I want it to look like graph paper (so horizontal and vertical lines) and then make different shapes so I can practice.

**physics**

two equal vectors of magnitude 2A are inclime perpendicular to each other find the resultant and direction of vector.

**Math**

area = 1/2 (b1 + b2)h 24 = 1/2 (12)h Yes 4

**algebra**

This is a parabola. (x+4)(x-3) = 0 x = -4 or x = 3 This is where you would be crossing the x axis. You want the turning point which would be a minimum since this parabola opens upward. I know it opens up because the coeff. of x^2 is positive. -b/2a = x -1/2 = -1/2 then find y...

**math**

You need to change all of them to the same form. Maybe decimals would be the best. .64, .6666, .65, .70 can you order them now?

**math**

Add up all of the votes then divide that number into 855. 855/1500 move the decimal two places to the right and add the % sign.

**math**

35% of the 120 miles = ? .35 times 120 = Just multiply by .35 and you will have the answer.

**math**

P=2l+2w 36= 2(8)+2w 36 = 16 + 2w can you solve from here?

**chemistry**

Give equations showing the commercial methods for preparing of the halogens (F2, Cl2, Br2, and I2).

**algebra 1**

multiply to get 12 then you have to add the one decimal point to get 1.2 Unless you are talking abut 0.4 raised to the 3rd power. If so, you are multiplying .4 times .4 times .4

**algebra**

Take ln of both sides. ln of e^x is x x = ln 20.9 Use a calculator to find x by taking the ln of 20.9

**English**

its C and Mrs.Hayley you could have just gave her the answer

**Social studies**

The Answer is C, because I just took the test and I got a 100% on the frickin test I took 3 weeks just to do the typing part of.

**PHYSIC**

220KG

**Math**

My border is 9 feet long and 1/3 foot wide each tile measures 1/3 foot by 1/3 foot each box of tiles contains 6 tiles how many boxes of tile,do I need show 2 equations to solve the problem

**perimeter**

If the 15 and 20 represent the width and the length then multiply the two numbers to find the area in square meters. Multiply that number by $25 to get the cost.

**Math**

Multiply 12 times 16 to get the area in square meters. then multiply by $15 to get the cost. Does that make sense?

**algebra**

y = a(x-h)^2 +k y = -5(x+2)^2 - 8 Since a is negative, we know that the parabola will face down, so we will have a maximum and not a minimum The vertex is given as (-h,k) You have a -2 because it has to be the opposite of 2 and -8 for k because it is supposed to be the same ...

**Math**

You could subtract 14/K from both sides. (8-14)/k = 3 -6/k = 3 -6 = 3k Divide by 3 to get k = -2 Check in the original equation to be sure it is correct.

**Grade 5 math**

Answered this a couple of minutes ago below.

**business math**

x + .32x = 9,357 1.32 x = 9357 Divide both sides by 1.32 to find the actual cost.

**math**

3 in. / 5 ft = 4 1/8in divide by ?ft 3/5 = 33/8 divided by x multiply both sides by x. 3x/5 =33/8 Multiply both sides by 5/3 x = (33 times 5) divide by (3 times 8).

**Math**

change all times to minute (130 +200 +75 + 160 + x)/5 = 128 Simplify by summing all of the times. Multiply both sides by 5 subtract your sum from that number to find x. Rewrite minutes int hours and minutes.

**Math**

You could double the amounts and it should taste the same 2/3 2/6 2/4 2/4 simplifies to 2/3 1/3 1/2 1/2 You could triple it, etc.

**math**

help @Ms.Sue

**math**

pls help which values will be part of the sequence 3,4,5,6,7,5... 9 11.5 15 19.5 my answers 9 11.5 15

**math**

Find: Two numbers whose sum -10 and whose product is 5. ;;; x+y = -10 x= -10-y xy=5 (-10-y)y=5 -10y-y^2 = 5 -y^2-10y-5=0 y= -9.47213595499958 and y= -0.52786404500042 Two numbers whose sum is 1 and whose product is 1. ;;; y= (-1+ sqrt(-3))/-2 y= (-1 - sqrt(-3))/-2 Find the ...

**math**

Suppose ad-bc=0, c≠0, and d≠0. What can be deduced about a/c and b/d?

**MATHS**

300+50d =1860 -70d 120 d = 1560 day = 13

**statistics**

Find the z-scre 14.98 - 10.43 divided by 5.60 z=.8125 Once the z score is 2 or greater than what happens would be highly unusual. Since the z-score is less than 2, I would say it is possible for the stock to go up.

**math**

I agree with A because Box plots do not include means. I agree with your answer. They might want you to look at skewness. If the data is skewed you would use the IQR. Q1 65 95 median difference of 30 95 median Q3 125 difference of 30 not skewed so SD could be used. second one ...

**statistics**

you have to find the mean and the standard deviation of the data. mean = 16.7 sd =26.02 this is if the first number is 95, but I am thinking you meant 9 and 5. mean =8.58 sd = 2.065 To find a z-score subtract the mean from the given value and divide by the sd.

**Math**

A particle is traveling along a straight line. Its position at time t is given by s(t)=7t^(2)+7. Find the velocity at time t=7.

**math**

Solve for X (3x+2)^(1/3)=-2 I multiplied (3x+2)^(1/3) by the power of to cancel the 1/3 I put -2 to the power of 3 as well getting -8 After I subtracted 2, getting me -6 dividing by 3x, I got -2 as my answer. Is this correct?

**Math**

Solve for X (8)^0(8)^x-4=512^X 8^0=1 512=8^64 8^x-4=(8^64)^x x-4=64x -4=63x -(63/4)=x Is this correct

**Math**

Solve for X (1/2)^2-x=(32)^x+1 I'm very confused on how to begin this problem.

**math**

I'm wondering if someone could please help me label this correctly?

**math**

In a freshman class of 3500 students at a particular college, 20000 are taking either a history of English class their first semester. Of these 2000 students, 1300 are taking both a history class and an English class, and 375 are taking only a history class. Draw a Venn ...

**Math - Percents**

Harry and Justin have 180 stickers. If Harry has 25% more stickers than Justin, how many stickers does Justin have?

**MATH HELP**

I need help to find out the area of base, how to find it and how to find the total volume for a cone on a cylinder please help

**Physical Science**

You drop a water balloon off of a tree branch, and you time the drop time at Δt = 1.16 sec, from the instant you drop it to the instant it impacts the sidewalk. What is the height of the tree branch?

**math**

I need help with composite solids involving pythagereom theorem. like how to solve it, what to do first, HOW TO FIND THE AREA OF BASE OF PRISM, etc can you please help me for this, cubes with cylinders in it, and a cone on a cylinder. i need help on those

**math**

I'm not sure, it just didn't seem correct -- but thanks, I guess I will go with it! :)

**math**

10/20 + 11/13 I know I have to first find the LCM which is 260. Then I found the equivalent fractions which were 130/260 and 220/260. When I add those I get 350/260 which is an improper fraction. Then I change that to a mixed number fraction. The answer I got was 1 9/26 but ...

**physics**

An Air plane flys from san fransico to new-york about 4800km at speed of 300m/s how much time does trip take as measured by observer in the plane?

**math**

Thank you, Vin Mwale. Are there any constants or any variables here?

**math**

Identify all components of this statement: 3a + 2b = 7. Is this an equation or an expression and why? o Constant o Variable o Term o Expression o Equation

**Calculus**

Which of the following integrals correctly computes the volume formed when the region bounded by the curves x^2 + y^2 = 100, x = 6, and y = 0 is rotated around the y-axis? I've narrowed it down to either pi∫(sqrt(100-y^2)-6)^2 dy or pi∫(sqrt(100-y^2)^2-6^2) dy ...

**Calculus**

Find the volume of the solid formed by revolving the region bounded by the graphs of y = x^2, x = 4, and y = 1 about the y-axis. I'm supposed to use this equation right? piR^2-x^r^2. and then change y=x^2 to x=sqrty. That's all I got.

**Calculus**

Find the number a such that the line x = a divides the region bounded by the curves x = y^2 − 1 and the y-axis into 2 regions with equal area. Give your answer correct to 3 decimal places.

**math**

(1)given that -2x^2+6x+7=0, if alfa and B are the roots of the equation, form new equation whose roots are(a)alfa/B and B/alfa (b)alfa/B^2and B/alfa^2(b) if alfa and B are the roots of the equation 4x^+8x-1=0. find the values of alfa^3 B+alfaB^3

**math HELP**

i need help with everything because these make me confused, can you help me on what to do for each solid? if not its fine then but i need help so i can pass this test, i get really confused on what i should do first, then after that so i need the steps please(for all of shapes...

**math HELP**

what is the most easiest way( or can you teach me) for Pythagorean theorem using composite solids for my test tomorrow?