# Posts by John

Total # Posts: 8,289

**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 ...

*September 20, 2016*

**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

*September 19, 2016*

**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...

*September 19, 2016*

**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.

*September 19, 2016*

**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...

*September 19, 2016*

**math**

Simple interest 400(.05)(2) = $40 compound 400(1.05)^2

*September 18, 2016*

**PHYSICS**

32/ft/sec^2 or 9.8 m/sec^2

*September 18, 2016*

**Math**

okay

*September 18, 2016*

**Math**

Is the first one (y-5)/3= 1 multiply by 3 y-5 = 3 add 5 y = 8 6x =-24 divide by 6 so x = 4

*September 18, 2016*

**math**

-4x-4b =p + 8b -4x =p +12b divide by -4 D

*September 18, 2016*

**Math**

1 lb he saves 13.60 then for the other 1/8 he saves 1/8 of 13.60 Divide 13.60 by 8 and then add that answer to 13.60

*September 18, 2016*

**math**

just subtract 1/2 x from both sides r- 1/2 x =y

*September 18, 2016*

**Math**

A = x^2 P = 4x A = 1/2 P x^2 = 2x x^2 -2x =0 (x)(x-2) = 0 x= 0 and x = 2 Ans x=2

*September 18, 2016*

**Math**

are you solving for r or h

*September 18, 2016*

**Mathematics**

Thanks. Forgive my grammar.

*September 18, 2016*

**Mathamatics**

If it has been determined that the probability of an earthquake occurring on a certain day in a certain area is 1 over 20 , what are the odds against an earthquake? Would the answer be 19:1?

*September 18, 2016*

**stats**

The area between -1.75 and 1.75 is equal to .91988 or .92 I would use those z-values. You can get these values from looking at a z-table. There are many different version of z-tables. You might be able to see the tails in it or a cumulative area z-table. Think of 92% being in ...

*September 18, 2016*

**Math**

If we toss four fair coins, what is the probability that we get more heads than tails? HHHH TTTT HHTT TTHH HTHT THTH HHHT TTTH HTTH THHT Would the answer be 2/10? I am a little confused. Thanks for the help!

*September 18, 2016*

**Physics**

A man claims that he can hold onto a 9.0-kg child in a head-on collision as long as he has his seat belt on. Consider this man in a collision in which he is in one of two identical cars each traveling toward the other at 49.0 mi/h relative to the ground. The car in which he ...

*September 18, 2016*

**Physics**

My bad, i switched initial velocity with final velocity in my equation. I actually got 13.82 (13.8 with sig figs). Is my answer still true?

*September 17, 2016*

**Physics**

An automobile accelerates 1.77 m/s2 over 6.00 s to reach freeway speed at the end of the entrance ramp. If the car's final velocity is 24.44 m/s, what is it's initial speed when it began accelerating. the answer i got was 35.06 m/s (35.1 m/s when doing sig figs). I ...

*September 17, 2016*

**Algebra**

y = .05(x-50) +100 If total number of text messages = x

*September 17, 2016*

**math**

A scuba diver dove from the surface of the ocean to an elevation of −99 9 10 feet at a rate of −30.7 feet per minute. After spending 14 minutes at that elevation, the diver ascended to an elevation of −8 9 10 feet. The total time for the dive so far was 21 1 ...

*September 17, 2016*

**linear programming**

Solve the following LP problem graphically MAX 2X + 7Y Subject to: 5X + 9Y >= 90 9X + 8Y <= 144 Y <= 8 X, Y >= 0

*September 16, 2016*

**linear programming**

Solve the following LP problem graphically MAX 2X + 7Y Subject to: 5X + 9Y >= 90 9X + 8Y <= 144 Y <= 8 X, Y >= 0

*September 16, 2016*

**linear programming**

Solve the following LP problem graphically MAX 2X + 7Y Subject to: 5X + 9Y >= 90 9X + 8Y <= 144 Y <= 8 X, Y >= 0

*September 16, 2016*

**linear programming**

Solve the following LP problem graphically MAX 2X + 7Y Subject to: 5X + 9Y >= 90 9X + 8Y <= 144 Y <= 8 X, Y >= 0

*September 16, 2016*

**Math**

seems right to me.

*September 16, 2016*

**math, please double check me**

Using a t-test I agree with -6.37. However, it is significant because -6.37 is a large t-value. I would never use a t-test when dealing with % which are equivalent to proportions. I would have done a 1 proportion z-test... but given the choices that you were given it looks ...

*September 15, 2016*

**Algebra II**

Maria's car averages 44 miles per gallon. Maria wants to determine how far she can drive based on the gallons of gas in her car. Write an equation to determine how far she can drive based on the gallons of gas in her car. What is the rate of change (slope) for Maria's ...

*September 14, 2016*

**Math**

6 sqrt(16) - 2 sqrt(12) 24 - 4 sqrt (3)

*September 13, 2016*

**math**

25/155 = 60/x solve for x show your work

*September 12, 2016*

**Government**

Do you have the answers

*September 12, 2016*

**Physics: Conversions**

Naval Question: MIDN Rabbit recently completed the NAVY PFA last Friday. During the course of CRUSHING the run and setting a new PR of 7:55, he/she performed a total of 1.1 million ft-Ibf of work. 1). Convert 1.1 million ft-Ibf of work to BTUs 2). Assume MIDN Rabbit's ...

*September 11, 2016*

**Exponential Inequalities**

Start with = then we will worry about the inequality. 2/5 raised to the 5x-1 = 25/4 take the log of both sides and then use the law of logs. (5x-1)(log 2/5) = log (25/4) (5x-1) = log(25/4) divided by (log 2/5) simplify that then solve for x by adding 1 to both sides and then ...

*September 11, 2016*

**Algebra**

y =70 + .40x y = 30 + .80x 70 + .40 x < 30 + .80x -.40x < -40 x > 100 When you multiply or divided across an inequality by a negative, you change the direction of the inequality.

*September 11, 2016*

**Math**

17 = k 24 17/24 = k y = 17/24 k

*September 10, 2016*

**Algebra**

Solve for n. Multiply both sides of the equation by 4. 1+ n = 16 subtract 1 from both sides n = 15 check by putting 15 into the original equation to see if both sides reduce to 4.

*September 10, 2016*

**Chemistry**

Your lab partner tells you that he has prepared a solution that contains 1.5 moles of NaOH in 1.5 L of aqueous solution, and therefore that the concentration of NaOH is 1.5 M. (a) Is he correct (b) If not what is the correct concentration

*September 10, 2016*

**Evans**

A school district has 2 teaching positions to fill and there are 8 applicants to choose from. How many different possibilities are there?

*September 10, 2016*

**Math**

Machine A was able to finish copying a set of document in 36 minutes. Machine B was brought in to work together with machine A to finish copying the document in 20 minutes. How long would it take machine B to finish copying the document by itself

*September 9, 2016*

**Algebra HELP PLEASE**

sale price = original - .25(original) or sale price = .75(original) Sale price = 40 - .25(40) or Sale price = .75(40) You should get the same answer using either one of the expressions.

*September 9, 2016*

**Math**

29 - 10 = 19 droughts only 16- 10 = 6 chess only. if you were using a Venn Diagram two circles intersection with the 10 in the intersection 19 in the drought only part of the first circle 6 in the chess only part of the 2nd circle. That will add to 35.

*September 9, 2016*

**Chemistry**

Larry has 250.00 ml of water. The water currently holds the maximum amount of soluble Silver iodide. In a separate container, Larry has 96 ml of a 0.07M solution of sodium carbonate. He wants to precipitate out all of the silver. Of his 96 ml, how much will he have to pour ...

*September 7, 2016*

**math**

where do you put parenthese to make this number sentence true 3x8/4+2=12

*September 7, 2016*

**Math**

7 = x + 10y 8 = x + 15y 1 = 5y y =1/5 x = 5 5 + 1/5 *8 = your answer

*September 4, 2016*

**Math College 115**

43/60 = hours miles/hour 2 divided by 43/60 2 times 60/43 120/43 divide and round to 2 decimal places distance = rate x time distance = (your answer from above) * time

*September 4, 2016*

**Math College 115**

F = 9/5 C + 32

*September 4, 2016*

**Math**

8 increase by the product 2(x-2) 8 + (2(x-2)

*September 4, 2016*

**Math**

How many five-card hands chosen from a standard deck contain two hearts and three spades? How do I solve this?

*September 4, 2016*

**MATH**

How many five-card hands chosen from a standard deck contain two hearts and three spades?

*September 4, 2016*

**Algebra**

x^3 -x^2 + x -1 Factor by grouping x^2(x-1) + 1 (x-1) (x^2+1)(x-1) For the second one x^2 -1 factors to (x-1)(x+1) The LCM (x^2 +1)(x-1)(x+1)

*September 2, 2016*

**algebra 1**

I am assuming that you typed this correctly 3(3^5 /9) 3(27) = 81

*September 2, 2016*

**Math**

replace the n with 2n -3 times 4^4n +1 In the original problem I am not sure if you have 4^(2n+1) or 4^2n plus 1. if it is the first -3 times (4^(4n_+1) that would be the answer because you cannot multiply the -3 times the 4.

*September 2, 2016*

**math**

read it carefully. write down what you know look for key words less than - subtract more than - add twice as much - two times half as much 1/2 Look for the same as or equal to "="

*August 30, 2016*

**maths**

1,1 = 1 1,2 = 2 1,3 = 3 1,4 = 4 1,5 = 5 1,6 = 6 do the same for 2 all the way to 6. To do the prob distrib. take the total number of products (should be 36) 1, 1 = 1 happens only once 1/36

*August 30, 2016*

**Math**

The numbers 1 - 6 on horizontal There are 2 fives There are 2 sixes There are 2 threes

*August 30, 2016*

**Algebra**

multiply everything by 3x (3x)(5x) + 6 -9(3x) = 7x 15x^2 + 6 -27x =7x 15x^2 -34x +6 =0 Use the quadratic to solve.

*August 29, 2016*

**Math**

Write an expression for 25 less than double a number n

*August 25, 2016*

**physics**

A plane flies from base camp to Lake A, 260 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 150 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to the base camp. ...

*August 24, 2016*

**physics vectors**

While exploring a cave, a spelunker starts at the entrance and moves the following distances. She goes 75.0 m north, 250 m east, 109 m at an angle θ = 30.0° north of east, and 156 m south. Find the resultant displacement from the cave entrance. The figure below ...

*August 24, 2016*

**physics vectors**

A plane flies from base camp to Lake A, 260 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 150 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to the base camp. ...

*August 24, 2016*

**physics vectors**

In the figure below, a spider is resting after starting to spin its web. The gravitational force on the spider is 0.158 N on the junction of the three strands of silk. The junction is supported by different tension forces in the two strands above it so that the resultant force...

*August 24, 2016*

**physics vectors**

If vector A = (6.00 i -8.00 j) units, vector B = (-8.00 i + 3.00 j) units, and vector C = (25.0 i + 22.0 j) units, determine a and b such that (a vector A + b vector B + vector C= 0.) a=? b=?

*August 24, 2016*

**math**

A plane flew due south from a point A, 60°north and 45°east to a point B.The distance covered by the plane was 8000km. Determine the position of B.

*August 24, 2016*

**physics vectors**

A snow-covered ski slope makes an angle of θslope = 34.0° with the horizontal. When a ski jumper plummets onto the hill, a parcel of splashed snow is thrown up to a maximum displacement of 1.10 m at θsnow = 24.0° from the vertical in the uphill direction as ...

*August 23, 2016*

**physics vectors**

Consider the two vectors A with arrow = 3 i − j and B with arrow = − i − 6 j. Calculate the directions of A with arrow + B with arrow and A with arrow − B with arrow. A with arrow + B with arrow ° (counterclockwise from the +x axis) A with arrow &#...

*August 23, 2016*

**physics**

A plane flies from base camp to Lake A, 260 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 150 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to the base camp. ...

*August 23, 2016*

**physics vectors**

i don't understand the direction

*August 23, 2016*

**science**

While exploring a cave, a spelunker starts at the entrance and moves the following distances. She goes 75.0 m north, 250 m east, 109 m at an angle θ = 30.0° north of east, and 156 m south. Find the resultant displacement from the cave entrance. The figure below ...

*August 23, 2016*

**Math**

Change the next 3 numbers

*August 23, 2016*

**Math**

How do you compare whole numbers through the millions?

*August 23, 2016*

**Social Studies PLEASE HELP!**

How does the US regulate the gathering/use of wood? I am working on a school project, I am supposed to research, I looked everywhere in my textbook and online and couldn't find anything. Can anyone help me?

*August 23, 2016*

**Social Studies**

Freds answers are correct

*August 22, 2016*

**Algebra**

Not sure why I thought I wasn't able to divide 32.4k by 9.9 Anyways, thank you for the help, my answer came out to 3.98 (rounded up)

*August 22, 2016*

**Algebra**

Need some help with this question 65.9 - 32.4k/9.9 = 13.3k / stands for a fraction bar

*August 22, 2016*

**Math**

This is a long division problem Divide 24 into 576020 When you get to a number less than 24 that is the amount that will be donated.

*August 19, 2016*

**Math**

I think you meant all 3 pillows. 4 inches times 4 sides = 16 inches then 16 inches time 3 pillow = 48 inches

*August 18, 2016*

**Math**

-1/2 + 2 = 1 1/2

*August 17, 2016*

**physics**

calculate the escape velocity of a satellite from the earth's gravitational field,if the radius of the earth is 6.4×10^6m

*August 17, 2016*

**Science**

I like 1.

*August 15, 2016*

**Math**

.72 would be 72/100 if repeating 72/99 always create the non repeating and subtract 1 from the denom. now reduce 72/99 to 8/11

*August 15, 2016*

**Math**

A = K cube root 8 divided by 2/3 A = K 2 times 3/2 A =2k K stands for a constant. I don't know if your teacher wants A= 2 or 2K for the answer.

*August 15, 2016*

**math**

1/3(10t + u ) = t + u + 1 3t = u 1/3 (10t + 3t) =t + 3t +1 1/3 13t = 4t + 1 13t = 12t + 3 t = 3 u = 9 check: 1/3(39) = 3 + 9 + 1 yes 13 = 13

*August 15, 2016*

**Math**

nicely

*August 13, 2016*

**probability**

John hs 3 red markers and 5 blue markers. What is the probability that he picks a red marker, and then, without replacing it, selects another red marker? Please show me how to set this up (you don't have to give me the answer)...thank you

*August 10, 2016*

**math**

I agree

*August 10, 2016*

**physics**

A cm^3 is a block that is a cm x cm x cm. If you have a piece of gold that is that size. 1 cm x 1cm x 1cm then it will have a mass of 19.6 grams. Just another note a cubic cm is also equal to a milliliter.

*July 31, 2016*

**Chemistry**

If 0.896g of a gas occupies a 250mL flask at 20 degree celcius and 760 mmHg of pressure, what is the molar mass of the gas?

*July 27, 2016*

**Math**

5 units to the left because you are going from a -2 to a 3 which is a difference of 5.

*July 26, 2016*

**Statistics**

Question was 15 years or more.. so the answer is 41.9% or 42%

*July 26, 2016*

**Math**

The average age of Ali,Ben and Chandra is 10 years.Ali is 3 years older than Ben.Ben is 6 years older than Chandra.how old is Chandra

*July 21, 2016*

**Physics or Math**

Question: A Toyota car travelled at the rate of 70 km/hour leaves the house 2 hours after a Kia car has left and overtakes it in 5 hours. at what rate was Kia car travelling? what's the formula pls?

*July 21, 2016*

**Physics**

Question: A Toyota car travelled at the rate of 70 km/hour leaves the house 2 hours after a Kia car has left and overtakes it in 5 hours. at what rate was Kia car travelling? What's the formula?

*July 21, 2016*

**Physics**

Question: A Toyota car travelled at the rate of 70 km/hour leaves the house 2 hours after a Kia car has left and overtakes it in 5 hours. at what rate was Kia car travelling? What's the Formula pls? Thanks

*July 21, 2016*

**Physics**

Question: A Toyota car travelled at the rate of 70 km/hour leaves the house 2 hours after a Kia car has left and overtakes it in 5 hours. at what rate was Kia car travelling?

*July 21, 2016*

**College Chem.**

A scientist adds 1.00 moles of phosphoric acid to a liter of water to make a solution. How many moles of NaOH should be added to ensure that the concentration of H2PO4- is equal to three times the concentration of HPO42? Remember that H3PO4 is a triprotic acid. I don't ...

*July 21, 2016*

**statistics**

Break even is when R(x) =C(x) 200x - x^2 =70x +2200 0 = x^2 -130x +2200 Factor (x-110)(x-20) = 0 x = 110 or x =20 Given the values of x stated above. Your only possible answer is 20.

*July 20, 2016*

**mathematics**

There are 7 days in a week. 1/7 chance that today is Tuesday. If today is Tuesday then we have a probability of 1 that tomorrow is Wednesday. 1/7 times 1 = 1/7

*July 20, 2016*