Friday

April 18, 2014

April 18, 2014

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**Math**

This is what I got too, but it says that my answer is wrong.
*Monday, April 7, 2014 at 8:26pm*

**math**

505200000000000 = 505,200,000,000,000 = 505.2 * 10^12 = 5.052 * 10^14 so YES :)
*Monday, April 7, 2014 at 8:25pm*

**math**

Have to write the number would it be 505200000000000
*Monday, April 7, 2014 at 8:21pm*

**Math**

sin 2x - sinx =0 2sinx cosx - sinx = 0 sinx(2cosx - 1) = 0 sinx = 0 or cosx = 1/2 for sinx = 0 x = 0, 180°, 360° for cosx = 1/2 x = 60° , 300° so for 0 ≤ x ≤ 360° x = 0, 60, 180, 300, 360 in radians: x = 0 , π/3 , π , 5π/3 , 2π
*Monday, April 7, 2014 at 8:20pm*

**math**

5.052 x 10^14
*Monday, April 7, 2014 at 8:16pm*

**science/math**

1. No If it hits at 42 from the SURFACE that is 90-42 = 48 from the normal. The reflected ray will also be 48 from the normal. 2. NO 27 + 27 = 54
*Monday, April 7, 2014 at 8:15pm*

**Math**

just plug in t = 3 P(3) = 100(1 - e^-.36) = 30.23 So appr 30.2%
*Monday, April 7, 2014 at 8:15pm*

**Math**

sin 2 x = sin x when x = 0, 180, 360 etc
*Monday, April 7, 2014 at 8:13pm*

**Math**

Now I did problems very similar to this for you earlier. You try and I will check if I am around.
*Monday, April 7, 2014 at 8:10pm*

**Math**

Find the exact solutions of the equation In The interval.. Sin 2x -sin x=0
*Monday, April 7, 2014 at 8:10pm*

**Math**

You sure are having quite a time with these exponential functions! y = 190 [ 1- .955 e^-(.25 t) ] If t = 9 y = 190 [ 1 - .955(.105) ] = 190 [ 1 - .1 ] = 171 cm In other words it has reached 90% of max length in 9 years now dy/dt = 190(-.955) (-.25)(.105) = 4.76 cm/year c) when...
*Monday, April 7, 2014 at 8:09pm*

**science/math**

1. A light ray strikes a mirror at an angle of 42° from the surface of the mirror. What angle does the reflected ray make with the normal Ans. 42° 2. A ray of light hits a mirror at 27° from the normal. What is the angle between the reflected ray and the normal. ...
*Monday, April 7, 2014 at 8:08pm*

**Math**

P(t) = 100(1-e^-0.12*3) P(3) = 100(1-0.6977) = 30.23% Fails. 100% - 30.23% = 69.7% Usable.
*Monday, April 7, 2014 at 8:05pm*

**math**

Right. :-)
*Monday, April 7, 2014 at 8:03pm*

**math**

I got 0.675?
*Monday, April 7, 2014 at 7:53pm*

**Math**

The percentage of a certain brand of computer chips that will fail after t years of use is estimated to be P(t) = 100(1 − e−0.12t ). What percentage of this brand of computer chips are expected to be usable after 3 years? (Round your answer to one decimal place.)
*Monday, April 7, 2014 at 7:50pm*

**Math**

Phosphorus-32 (P-32) has a half-life of 14.2 days. If 200 g of this substance are present initially, find the amount Q(t) present after t days. (Round your growth constant to four decimal places.) How fast is the P-32 decaying when t = 21.5? (Round your answer to three decimal...
*Monday, April 7, 2014 at 7:49pm*

**math**

Divide.
*Monday, April 7, 2014 at 7:49pm*

**math**

0.325 = three hundred twenty-five ten thousandths
*Monday, April 7, 2014 at 7:49pm*

**Math**

The length (in centimeters) of a typical Pacific halibut t years old is approximately f(t) = 190(1 − 0.955e−0.25t). (b) How fast is the length of a typical 9-year-old Pacific halibut increasing? cm/yr (c) What is the maximum length a typical Pacific halibut can ...
*Monday, April 7, 2014 at 7:48pm*

**math**

During a recent free throw basketball tournament, jessica makes 27 out of 40 free throws. Express this amount as a decimal.
*Monday, April 7, 2014 at 7:44pm*

**math**

A professional baseball player has a battung average of 0.325 , express the players batting average as a fraction in simplest form.
*Monday, April 7, 2014 at 7:43pm*

**math**

Right. 15% of her answers were wrong.
*Monday, April 7, 2014 at 7:34pm*

**Math**

The largest exponent of the variable is 2. Therefore, it is a 2nd degree polynomial.
*Monday, April 7, 2014 at 7:34pm*

**math**

I am not sure but I have 15?
*Monday, April 7, 2014 at 7:29pm*

**Math**

I got the answer .22882 is that correct?
*Monday, April 7, 2014 at 7:25pm*

**math**

You mistyped Green Marbles. I assume 3. Total marbles = 5 + 6 + 3 + 2 = 16 Total Blue and Green = 6+3 = 9 Fraction of those marbles = 9/16 = 0.5625 If there are not 3 marbles, then change.
*Monday, April 7, 2014 at 7:19pm*

**math**

And your answer is?
*Monday, April 7, 2014 at 7:18pm*

**MATH**

spam spam spam spam spam spam spam spam
*Monday, April 7, 2014 at 7:18pm*

**math**

On a recent math test, monique earned an 85%. Which value represnts the amount monique did not answer correctly?
*Monday, April 7, 2014 at 7:18pm*

**math**

If you post your answers, I'll check them.
*Monday, April 7, 2014 at 7:18pm*

**Consumer Math**

I don't entirely understand the question. Let me do my best. $187,500 is cost of house. 20%, or $37,500 is the down payment. The loan amount would be $187,500 - $37,500 = $150,000. If we assume the annual rate of the loan is 4.65% Then the monthly rate would be 4.65%/12 = ...
*Monday, April 7, 2014 at 7:16pm*

**Math**

12.5/5 = x/8
*Monday, April 7, 2014 at 7:13pm*

**math**

There are 5 red marbles, 6 blue marbles, e green marbles, and 2 yellow marbles in a bag. What percent or fraction represents the number of blue and green marbles in the bag?
*Monday, April 7, 2014 at 7:11pm*

**math**

The New Jersey state lottert is $173,000,00. If you and your family win the lottery and recieve 5% of that amount for the next twenty years how kuch money will you recieve each year?
*Monday, April 7, 2014 at 7:09pm*

**Math**

This is about ratios Jason spent $12.50 for 5 ft of 6 in copper pipe. He returned after 2 days to buy 3 more feet of the same pipe. How much did he spend in all for a pipe
*Monday, April 7, 2014 at 7:05pm*

**math**

I'll be glad to check your answer.
*Monday, April 7, 2014 at 7:03pm*

**MATH - Algebra**

yes, except you had 22x, not 11x So, the answer is x^2 + 2x also, be sure to use parentheses to make it clear that you mean (11x^2+22x)/11 and not 11x^2 + (22x/11)
*Monday, April 7, 2014 at 7:03pm*

**math**

Which set of numbers does not contain three numbers that are equivalent? - Choices are:- A. 1/2,0.5,50% B. 1/5,0.02,20% C. 1/8,0.125,12.5% D. 1/20,0.05,5%
*Monday, April 7, 2014 at 7:01pm*

**Math**

well, we have cosa = 12/13 sinb = 4/5 So, just plug them into cos(a+b) = cosa cosb - sina sinb
*Monday, April 7, 2014 at 7:00pm*

**math**

0.97 * 57,545 =
*Monday, April 7, 2014 at 7:00pm*

**math**

Yankee stadium can seat 57,545 people. At a recent game, it was reported that appoximately 97% of the tickets were sold. Based on that report, what is the best estimate for how many people attended the game?
*Monday, April 7, 2014 at 6:59pm*

**MATH ✿╣Check╠✿**

looks good to me
*Monday, April 7, 2014 at 6:59pm*

**math**

You are welcome.
*Monday, April 7, 2014 at 6:57pm*

**math**

120/200 = 12/20 = 3/5
*Monday, April 7, 2014 at 6:52pm*

**math**

15/24 = 5/8 = 0.625
*Monday, April 7, 2014 at 6:51pm*

**MATH - Algebra **

Help with problem already posted. Thanks
*Monday, April 7, 2014 at 6:47pm*

**math**

Martha read 120 pages in her book, which has a total of 200 pages. Which fraction best represents the portion of the book that she has not read?
*Monday, April 7, 2014 at 6:44pm*

**math**

Select the best graph: 1. What data display would best list the frequency of the number of students that received an 85% on test?
*Monday, April 7, 2014 at 6:43pm*

**math**

What is the equivalent form of 15/24?
*Monday, April 7, 2014 at 6:41pm*

**math**

Martha read 120 pages in her book, which has a total of 200 pages. Which fraction best represents the portion of the book that she has not read?
*Monday, April 7, 2014 at 6:39pm*

**Math**

3(0.4h+5)>4(0.2h+7)
*Monday, April 7, 2014 at 6:39pm*

**math**

Thanks a lot
*Monday, April 7, 2014 at 6:37pm*

**math**

Thank you
*Monday, April 7, 2014 at 6:37pm*

**Math**

Yes, because the the question said he arrived a quarter after eight.
*Monday, April 7, 2014 at 6:37pm*

**MATH ✿╣Check╠✿**

what is the surface area of a sphere with a radius of 5 meters rounded to the nearest square meter? MY ANSWER: 314m^2 (is it correct?)
*Monday, April 7, 2014 at 6:31pm*

**Math **

Angles A and B are located in the first quadrant. If sin a =5/13 and cos b= 3/5 , determine the exact value of cos (a+b) .
*Monday, April 7, 2014 at 6:31pm*

**Math**

You're welcome.
*Monday, April 7, 2014 at 6:22pm*

**Math**

Thanks!
*Monday, April 7, 2014 at 6:21pm*

**math**

A = pi * r^2 A = 3.14 * 64 A = _______ sq. m.
*Monday, April 7, 2014 at 6:21pm*

**Math**

X/5=12 Multiply both sides by 5 x = 60
*Monday, April 7, 2014 at 6:17pm*

**math**

Well-- since we can't sell four-tenths of a computer, it makes sense to round up to 63. Right?
*Monday, April 7, 2014 at 6:16pm*

**math**

I got 62.4 but the choices I have are 15, 34 , 63 , or 78
*Monday, April 7, 2014 at 6:13pm*

**math**

A circular sprinkler spreads water up to 8 meters away. What area of the lawn gets watered?
*Monday, April 7, 2014 at 6:12pm*

**math word problem**

Susan uses 15 rolls of ribbon to decorate 10 wedding baskets. Each roll of ribbon is 5 3/8 yards long. After she decorates the baskets, she decides to cut off another 3/4 yard from the ribbon of each basket. Write and simplify an expression to fin out how much ribbon was used ...
*Monday, April 7, 2014 at 6:11pm*

**Math**

Solve the equation My answer-60
*Monday, April 7, 2014 at 6:06pm*

**Math**

X/5=12
*Monday, April 7, 2014 at 6:06pm*

**math**

48 * 1.3 = ?
*Monday, April 7, 2014 at 5:59pm*

**Math please help**

A rectangular room has a perimeter of 36 feet.One side is 10 feet long.How long is side s?
*Monday, April 7, 2014 at 5:58pm*

**Math please help**

A rectangular room has a perimeter of 36 feet.One side is 10 feet long.How long is side s?
*Monday, April 7, 2014 at 5:58pm*

**math**

The sales team at an electronics store sold 48 computers last month. The manager at the store wants to encourage the sales team to sell more computers and is going to give all the sales team members a bonus if the number of computers sold increases by 30% in the next month. ...
*Monday, April 7, 2014 at 5:57pm*

**Math**

Angles A and B are located in the first quadrant. If sin a =5/13 and cos b= 3/5 , determine the exact value of cos (a+b) .
*Monday, April 7, 2014 at 5:54pm*

**5th grade math**

On each bounce a ball reaches 4/5 of the height of its previous bounce.How high will the ball bounce on its 3rd bounce? Also, how many bounces will it take the ball to bounce to a height that is less than 1/2 of the height of the first bounce?
*Monday, April 7, 2014 at 5:50pm*

**gerund phrases**

I am trying to wring this as a verb ? Earning an excellent grade in math
*Monday, April 7, 2014 at 5:50pm*

**Math**

If ???
*Monday, April 7, 2014 at 5:49pm*

**math**

1/2 base*height=area base=2*area/height
*Monday, April 7, 2014 at 5:48pm*

**math**

The area of a triangle is 135 square inches. If the height is 15 inches, what is the length of the base?
*Monday, April 7, 2014 at 5:46pm*

**Math**

22.Angles A and B are located in the first quadrant. If and , determine the exact value of . How do I get 16/65?
*Monday, April 7, 2014 at 5:44pm*

**math**

approximately ???
*Monday, April 7, 2014 at 5:41pm*

**math**

Right.
*Monday, April 7, 2014 at 5:33pm*

**math**

M = 3s s + 26 = m s + 26 = 3s 26 = 2s s = 13 54-13 = 41 Correct
*Monday, April 7, 2014 at 5:33pm*

**math**

Sally is 54 years old and her mother is 80, how many years ago was Sally’s mother three times her age? I believe that the answer is 41 years??
*Monday, April 7, 2014 at 5:22pm*

**math**

The percentage of a certain brand of computer chips that will fail after t years of use is estimated to be P(t) = 100(1 − e−0.12t ). What percentage of this brand of computer chips are expected to be usable after 3 years? (Round your answer to one decimal place.)
*Monday, April 7, 2014 at 5:16pm*

**math**

The length (in centimeters) of a typical Pacific halibut t years old is approximately. (b) How fast is the length of a typical 9-year-old Pacific halibut increasing? (c) What is the maximum length a typical Pacific halibut can attain?
*Monday, April 7, 2014 at 5:15pm*

**math**

Phosphorus-32 (P-32) has a half-life of 14.2 days. If 200 g of this substance are present initially, find the amount Q(t) present after t days. (Round your growth constant to four decimal places.) How fast is the P-32 decaying when t = 21.5? (Round your answer to three decimal...
*Monday, April 7, 2014 at 5:15pm*

**MATH - Algebra**

11x^2 + 22x/11 Am I on the right track? 11(x^2 + 11x)/11 = x^2 + X
*Monday, April 7, 2014 at 5:07pm*

**Math**

thank you I got the same answer! thanks :)
*Monday, April 7, 2014 at 4:57pm*

**math**

Jim paid $ 5.55 for 1 notepad and 7 pencils. Anne paid $ 12.28 for 3 notepads and 2 pencils. How much does each notepad cost? Show all work. Thanks
*Monday, April 7, 2014 at 4:56pm*

**Math**

You're welcome. http://www.mathsisfun.com/definitions/multiplicative-inverse.htm
*Monday, April 7, 2014 at 4:56pm*

**Math**

218/245 = 0.889 0.889 * 360 = 320 degrees
*Monday, April 7, 2014 at 4:56pm*

**Math**

Oh! Ok thank you!
*Monday, April 7, 2014 at 4:55pm*

**Math**

6 1/7 =43/7 Multiplicative inverse = 7/43
*Monday, April 7, 2014 at 4:53pm*

**Math**

A survey about the student government program at a school finds that of 245 students: • 218 students like the program • 27 students think the program is unnecessary If a circle graph were made from this data, what would the measure of the central angle be for the ...
*Monday, April 7, 2014 at 4:53pm*

**Math**

What is the multiplicative inverse of 6 1/7? My answer- 16
*Monday, April 7, 2014 at 4:49pm*

**Math, Geometry**

See previous post: Fri,4-4-14,1:14 AM.
*Monday, April 7, 2014 at 4:46pm*

**Math~**

!@#$%^& uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu !@#$%^&hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
*Monday, April 7, 2014 at 4:25pm*

**Math 11**

I am really stuck at these 4 questions. Pls help: a) Two spheres of the same density have a ratio of 9 to 16 inches in surface area, If the small sphere weighs 15 kg what does the sphere weighs. Answer to the nearest 10th of KG. b) The ratio of the volume of two cubes is 216 ...
*Monday, April 7, 2014 at 4:19pm*

**Math**

599/10 = 59.9
*Monday, April 7, 2014 at 3:52pm*

**Math**

4
*Monday, April 7, 2014 at 3:50pm*

**Math word problems**

Susan uses 15 rolls of ribbon to decorate 10 wedding baskets. Each roll of ribbon is 5 3/8 yards long. After she decorates the baskets, she decides to cut off another 3/4 yard from the ribbon of each basket. Write and simplify an expression to fin out how much ribbon was used ...
*Monday, April 7, 2014 at 3:36pm*

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