Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 918

**MATH PLZ**

Try some examples. + 8 - (-8) Remember when you subtract, you add the opposite in algebra +8 + (+8) = 16 + 10 - (-4) = " Look for a pattern.

**please help with geometry - dilation**

A square with an area of 4 has to have all sides equal to 2. Right? If I increase by a factor of k that means multiply 2 times k My area is 2k times 2k = 4k^2 I would set this equal to 9 I am getting 3/2 for the value of k -3/2 is another possibility, but we have to discount i...

**algebra**

Checking with what I think you have in your problem 7^3 times 7^2 times 8^5 in the numerator? If so you can simplify to 7^5 times 8^5 in the numerator The denominator: 8^4 times 7 times 8^-7 if so you can simplify the denominator to 8^-3 times 7 7^5 times 8^5 divided by 8^-3 t...

**algebra**

I am having trouble understanding what you mean for part a. Is the x a variable or are you writing it as a times sign to indicate multiplication? for b I am a little confused too. a raised to the -2 b raised to the 4 c raised to the 3 should everything in the ( ) be squared? i...

**Math plz fast i really need it**

For the first part, you really need to make a table to show all of the possible sums I suggest making a table with 1 -6 across the top and 1-6 down the side.. Then fill in the table by adding the die. 1,1 = 2 1, 2 = 3 You may be able to find a table like this in your book or b...

**stats**

.60 = republ .40 = democ rep x dem .6 x .4

**Math**

Divide both sides by 7 and that will isolate y.

**Calculus**

Take the derivative of the function because the derivative is equal to the slope of the tangent line. a horizontal line has a slope of zero. Set you derivative = 0 and solve for x. That should give you the correct value of x.

**math**

148 drachma = 1 dollar he spent 10 dollars so he should have 10 = 148 drachma. since the 3 items are priced the same just divide the above answer by 3.

**Math**

I meant to say s and h. You could do that which issubstitution or you could use the addition/elimination method -6h -6s <= 216 6h +8s >= 245 2s =461

**Math**

hours: h + s < or equal to 36 6h + 8s > or equal to 245 You can solve these just like you would equations. How would you solve h + s = 36 6h + 8s = 245 Multiply the first equation by -6 and then combine the equations to eliminate the x and solve for y. Substitute back in...

**Math**

You really need to know how to do it yourself. I can give you a hint. x >= 10 y>= 21 14x + 2y >= 300 (for part C just substitute here) so.. you have to graph x = 10 y = 21 14x + 2y = 300

**Math**

This is similiar to the one above. Try it based on those hints and I will be happy to check it for you.

**Engineering Econonmy**

To determine what you would have at the end of 3 or 5 years use: The following formula works for compounded annually. future value = P(1+r)^n for 1500 and 3 years at 8% 1500(1+.08)^3 Do this calculation and a similar one for the 5 year period and then compare.

**life orientant**

When a teenager has a baby... what happens? These are things to think about... how does this impact the community? Who pays the hospital bills? Who pays for diapers, formula, etc.? Who pays for the doctor? Can the teenager go back to school? Who watches the baby?

**math**

You have to change them all to decimal form to compare them. I would be happy to check your answer. For example 3/5 = .6

**Math**

5x(10) + 3 = 24 50x + 3 = 24 subtract 3 from both sides and then divide by 50 to find x. Be sure to check your answer by putting the value of x into the original equation.

**pre-algebra**

The mode is the number that is listed the most often. I don't see any number repeated. So, there is no mode.

**maths**

42 books have a mass of 8.4 kg. 8.4 kg/42 books = ?? kg/12 books This is the original proportion. Solve by dividing 42 into 8.4 That will give you the mass per book. Next you can find the mass of 12 books by multiplying 12 times the answer for the mass of 1 book. Then you can ...

**science**

Work = force x distance 286J = Force x 1.3 meters

**Pharmacy Calculaions**

I don't see the formula.

**science**

The force is due to gravity. Force = mass x g Force = 80 kg x 9.8 m/sec^2 answer is in newtons

**math**

Substitute for the values -5(5)^2 + 5(-3)^3 do the exponents first multiply second then add. I will be happy to check your answer.

**math**

You need to subtract 1/4 y from both sides. You need a common denominator of 28 before you can combine the fractions -8 will be alone with a frction in front of the y. Multiply both sides by the reciprocal of the fraction to solve for y. I will be happy to check your answer.

**math**

You do this the same way as the one above that I gave you a hint on. I will be happy to check your answer.

**math**

Add 1 to both sides then multiply both sides by 5/6 to solve for x. I will be happy to check your answer.

**math**

Subtract 1/4 from both sides. You will need to change 5 to 20/4 Next multiply both sides by 3 to solve for x. I will be happy to check your answer.

**math**

Eight subtracted from means something - 8 six times a number means 6x is means = can you write the equation?

**math**

This is easy. Just divide both sides by 14. 14x/14 is x on one side. what will you have on the other side ?

**science**

There is one zinc and 2 chlorine

**Algebra**

To find the axis of symmetry you find: x = -b/2a this comes from the quadratic formula.

**Math**

if 1/3 of the coins are dimes than we must have 2 dimes which = 20 cents so the value of the dimes is 1/4 the value of the other coins 20 cents = 1/4 (the other coins) so the other coins must be worth 80 cents So.. how much money does Kelsea have? H

**calculus**

rewrite the square root of x as x^1/2 This is the quotient rule. demoninator times the derivative of the numerator minus the numerator times the derivative of the denominator all over the denominator squared. So... We know the derivative will have an x^2 in the denomoniator. C...

**English**

What about star-crossed lovers. Maybe you could look at Romeo and Juliet and other star-crossed lovers in history. Also, the musical WestSide Story was an updated version with Tony and Maria. I don't know if you would want to make a comparison between the two.

**math**

If it is 30,00 or more.. I think you would just add all of the probabilities. .315+.180+.031

**Chemistry**

No, to make it neutral you would have to add OH ions. Water will dilute it and make it less acidic, but it still will be an acid.

**Math**

Simple interest is just: Interest = Principle x rate x time be sure to write % as a decimal to 5% = .05 and 3% = .03 You can add your interest to the original value to find the future value. Compounded annually: Future value = P(1+ rate)^time tiffany's problem: Future valu...

**Math**

Then you just have to multiply 2400 x .105 x 1.5

**Math**

Did you mean find the simple interest? If so... here is the method to use. Interest = Principle x Rate x time P = 2400 R = 10.5% use .105 in the formula T = 1.5

**Physics**

V= IR in this case V = I(R1+R2) so we have 15 = IR1 + IR2 (15 - IR1)/I = R2 we will use this later in our subsitution. We also know that... 15 =(I+.05)R1 and 15 = (I+.025)R2 since both equal 15, they must equal each other: (I+.05)R1 = (I+.025)R2 Use the substitution for R2 fro...

**Math incomplete**

I don't see your function.

**Geology**

I think it is by the fossils found in rock strata.

**Earth Science**

Now, I think it might be Potassium.. I just saw anothr post with K -40 has a half life of approx. 1.25 billion years.

**Earth Science**

You want a long half-life for older rocks. I think it may be argon, but you need to lookup the half-lives of each of them. You can probably google it.

**physics**

A - B = +5 A - C = -16 Do between B-C we must have -21

**quadrilaterals**

The sum of the angles = 360 paralleograms have pairs of equal angles. You have 110 degrees so far. Now can you find the other two angles?

**science**

a higher velocity or more mass??? is this is what you are looking for?

**math**

What do you need to know about percents? Percent means out of 100 like 20% means 20/100 or .20

**physics**

I would say no force since it is in free space. I am not 100% sure.

**math**

Add up all of the scores and then divide by 5 since you have 5 scores.

**algebra**

The y-intercept is easy in this form of the equation. Y = mx + b b is the y-intercept. Written (0,1) To find the x - intercept let y = 0 in the equation and then solve for x. (x, 0) is the form of the x - intercept.

**finance**

Just multiply 7100 times .109 since it is the apr.

**math**

If you sliced 12 and you need 30 total. that means you have 18 left to do and you can do 2 per minute. How many minutes will it take? I will check your answer.

**math**

Sorry, I don't. I am on her quite often.

**math**

Yes. that is it. I hope it makes sense to you.

**math**

(-8)(-2) that takes care of the coefficents = 16 (x^2)*(x^1) = x^3 (y^1)(y^3) = y^4 Now, put them all together and you will have the answer.

**math**

Multiply the coefficients (numbers in front). for the letters with exponents. You keep the letter and you add the exponents. Remember that y is y^1 Try it and I will check it for you.

**Science**

It depends on what you are going to use to compare the difference. suppose there were 20 people and 5 remembered better if they heard the numbers and 15 remembered better if they saw them. That could be a bar graph. If you were going to use a % right, you might want to make a ...

**Science**

Could you use a bar graph? One bar for eyes and one bar for ears??

**algebra**

Yes 5^3 or 125. I am not sure how your teacher will want the answer.

**algebra**

so keep the base of 5 and add the exponents for the multiplication. that gives you 5^11/5^8 For division, keep the base of 5 and subtract the exponents. What is your final answer?

**algebra**

By using the law of exponents, we cannot combine anything because the terms are all different.

**algebra**

You can't simplify because there are no like terms. Do you need to factor this?? or are you just being asked to combine like terms. If you have to factor it. that is possible. Let me know.

**Math**

You are welcome.

**Math**

Yes. Very good.

**Math**

of means multiply Multiply 3/5 times 65

**math**

We can start to take it apart using the law of logs. ln x^3 + 1/2 ln(y^4 - z^10) 3lnx + 1/2 (4)(lny)-1/2 (10) ln z Can you finish from here. Remember exponents become multiplications Multiplications can be changed to additions and Divisions can be changed to subtractions.

**math**

Let t = ten's digit Let x = one's digit t + x = 13 2t= x-1 or 2t+1 = x You can substitue for "x" t + 2t + 1 = 13 3t = 12 t = 4 find x = 9 so we have 49

**Math**

Right. The radius is 2.5 So you can see that the diameter is double the radius. or you can say the radius is 1/2 the diameter.

**Math**

The diameter is the distance across the circle and the radius is the distance from the center of the circle to the edge of the circle. I will be happy to check your answer.

**Math**

50% right.

**Math**

You can add the whole numbers and you can add the fractions. When you get 3/3 that can be changed to 1 which can be added to the sum of your whole numbers. I will check your answer.

**sci**

Force = G times (m1 x m2)/r^2 If you double the masses your have 4 times the force. since the distance is the same and the "G" is a constant.

**math**

You are welcome.

**math**

Correct. You have to be careful with the signs.

**math**

-3x -3x = -6x this is the same as -3x + -3x + -6x You are right, but missing the middle term. -3x + 3x = 0 that isn't what you had here.

**math**

You have to combine like terms. When you add you keep the variable(letter) with its exponent and and the coefficients (numbers in front) 3x + 5x = 8x You are going to combine your x^2 terms your x terms and your constants. Show me your answer and I will check it.

**math**

Right. Glad it makes sense.

**math**

NO.. p/8 40/8

**math**

no, you would divide. Let's say the perimeter is 40? Would it make sense to say a side is 320 or does it makes sense to say a side is 5?

**math**

no we have p = perimeter You want to use p and 8. Do you multiply or divide?

**math**

An octagon has 8 sides. Perimeter = 8 times length of 1 side.

**math**

Supplements add to 180 What is angle z? Complements add to 90. what is the complement of z?

**math**

18 miles is right.

**math**

you can cover 3 miles every 20 minutes You are walking for 12o minutes. 3 miles/20 minutes = x miles/120 minutes. The denominator of 120 is 6 times bigger than the denominator of 20. so you should go 6 times farther.

**math**

walking rate = 1/20 jogging rate = 3times or 3miles/20 minutes 2 hours = 120 minutes Can you finish from here?

**computer science**

I bet you could google this.

**Math**

tens digit + ones digit = 11 tens digit = 3 + ones digit t + x = 11 t = 3 + x substitute: 3 + x + x =11 3 + 2x = 11 Solve for x which represents the one's digit. Then find the tens digit.

**math**

This is a right triangle problem. c^2 = a^2 + b^2 c^2 = 8^2 + 15^2 remember to take the square root in the last step to find c.

***math***

I answered earlier. Let x = 0 and find y Let y = 0 and find x. Remember the pairs are written (x,y)

**Applied Calculus**

This is a chain rule. (the derivative of the whole thing times the derivative of what is in the parenth.) first derivative: (1/2)(5) (5t+4)^-1/2 Take the derivative of the above for the second derivative. Take the derivative of that answer again and you will have the 3rd deriv...

**OAA math *wolf***

Tell me what you think the answer is...

**OAA math *wolf***

If x = 0 find y. If y = o find x. That will give you the ordered pairs. Any time you have a MC question, you can check the values in the problem if you are stuck. (x,y) is the correct order in the ordered pairs.

**Math**

I would say recheck her work since the estimate and actual are so different from each other.

**Math**

compare y = x with y = mx+b m = slope What number is in front of the "x" in your equation?

**college algebra**

The best way to do it is using calculus, but you are in college algebra. You are looking for length + width + width = 1000 feet because you don't need any for the river side. L + 2w = 1000 or L = (1000 - 2w) A = lw A = (1000-2w)(w) A = 1000w - 4w^2

**trigometry**

It is always good to draw a picture. You have a right triangle with hypotenuse of 16. The side opposite the angle that you are looking for is 5. If you take the opp/hypotenuse = sine of the angle 5/16 = sin of angle. You can use your calculator to find the value of the angle. ...

**Algebra**

Solve for b? add a -1/6 to both sides of the equation. You have to combine -1/6 and -1/3 You need a common denomiator of 6.

**Applied Calculus**

I agree with your first derivative. Now, start with 10/(7x+10)^2 and take the derivative again. Denom times deriv of numerator = 0 since deriv of 10 = 0 minus the numer time the deriv of the denomin. - 10(2(7x+10)7) this is the chain rule You need to simplify this expression a...

**Math - Help with radicals please**

It seems that you need a lesson in everything you need to know about radicals. #3 You can't combine radicals unless they are the same like 3x - 2x = 1x So yo have to write 75 xy as 25(3xy) you can take the square root of 25 with the 3xy left under the radical. for 27x^3y w...

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