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April 19, 2014

Homework Help: Math

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Recent Math Questions

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Math
r/h = sin(a) v = 1/3 pi r^2 h = 1/3 pi h^3 sin(a)
Monday, April 7, 2014 at 3:34pm

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 3:32pm

math
all those angles are the standard ones you should know. cot pi/3 = 1/√3 csc pi/3 = 2/√3 cos pi/4 = 1/√2 plug it in and you have (1/√3 + 2/√3)/(1/√2) = √6
Monday, April 7, 2014 at 3:32pm

Math (check)
thank you!
Monday, April 7, 2014 at 3:29pm

math
the two legs are a and b, and the hypotenuse is √(a^2+b^2). So, assuming a,b > 0, So, in QII, sin2x = b/√(a^2+b^2) cos2x = -a/√(a^2+b^2) sin^2(x) = (1-cos2x)/2 = (1+a/√(a^2+b^2))/2 = (a+√(a^2+b^2)) / 2√(a^2+b^2) and similarly for cosx
Monday, April 7, 2014 at 3:29pm

Math
What is the number of tens for 599
Monday, April 7, 2014 at 3:13pm

math
if tan 2x= -b/a, pi/2 <=2x<=pi, then determine an expression for sinx cosx in terms of a and b. *please show the calculation
Monday, April 7, 2014 at 3:12pm

math
determine the exact value of (cot pi/3) + (csc pi/3) / (cos pi/4). how is this calculated? i mean the steps to get the exact value?
Monday, April 7, 2014 at 3:10pm

math
As a fundraiser a school club is sellin posters. The printer charges a $24 set up fee plus $o.20 for each poster. Then the cost y in dollars to print is given by the linear equation y=0.20x+24 A. The printing of 50 posters cost? The printing cost of 100 posters cost? B. Find ...
Monday, April 7, 2014 at 2:58pm

math
1 rotation = 360° = 2π radians at 7:00 the minute hand is on the 12 (straight up) and the hour hand has moved 7/12 of a rotation (7/12)(2π) = 7π/6 radians ---> or 210° so the smaller angle between the two hands = 2π - 7π/6 = 5π/6 ...
Monday, April 7, 2014 at 2:57pm

math
πd * 5 = 3.14 *16 * 5 = 251.2 Yep!
Monday, April 7, 2014 at 2:38pm

math
A grandfather clock shows a time of 7 o’clock. What is the exact radian measure of the angle between the hour hand and the minute hand? how is it calculated?*
Monday, April 7, 2014 at 2:38pm

math
B. 251.2
Monday, April 7, 2014 at 2:34pm

math
There are many ways, square with 10m sides, rectangle 2m by 18m, etc….
Monday, April 7, 2014 at 2:34pm

math
Please answer ASAP.. Awheel has a diameter of 16 cm. Approximately how far does it travel in 5 revolutions? A. 502.4 cm B. 251.2 cm C. 100.48 cm D. 80 cm
Monday, April 7, 2014 at 2:32pm

Math
It would depend on how you were measuring the temperature. There are two factors operating here. First, the water does lose heat. Second, the body adapts to the temperature, so even without losing heat, the water does not seem as hot. If only a thermometer is being used, that ...
Monday, April 7, 2014 at 2:29pm

Math (check)
Interpretation #1 : Slant height is the edge of the pyramid Consider the right-angled (internal) triangle formed by the height , half the diagonal of the base and hypotenuse being the slant height. let the slant height be x let the diagonal of the base be d d^2 = 1^2 + 12^2 = ...
Monday, April 7, 2014 at 2:26pm

math
3/10
Monday, April 7, 2014 at 2:25pm

math
hgcfy89uygyu
Monday, April 7, 2014 at 2:24pm

Math
I labelled the position of the church as C. angle C = 85° by the sine law: CP/sin35 = 600/sin85 CP = 600sin35°/sin85° = appr 345.5 m you do CQ
Monday, April 7, 2014 at 2:02pm

Math (check)
what is the slant height for the given pyramid to the nearest whole unit? with a pyramid base of 12cm and a height of 8cm. MY ANSWER: 14
Monday, April 7, 2014 at 1:57pm

Math
Erin has 36 Julia has 2/3 as many as Erin ---> she has (2/3)(36) or 24 Julia also has 1/3 as many as Robert 24 = (1/3)(Robert) Robert has 72 Erin has 36 Julia has 24 Robert has 72 for a total of 132
Monday, April 7, 2014 at 1:56pm

math
how do i build a rectangler pen using 40 meters
Monday, April 7, 2014 at 1:46pm

Math
Two towers P and Q are 600m apart with P being due east of Q. A church is on a bearing of 210 degrees from P and 125 degrees from Q. Find the distance of the church from P and Q.
Monday, April 7, 2014 at 12:56pm

Math
Julia has 1/3 has many stamps as Robert and also 2/3 as many stamps as erin. if erin has 36 stamps, what is the total number of stamps that the 3 children have?
Monday, April 7, 2014 at 12:31pm

Math
Find the volume of a right circular cone of height h and semi-vertical angle a (Hint: Rotate about the x-axis).
Monday, April 7, 2014 at 12:11pm

Math
So I have some questions that start with Do the data sets have a positive, a negative or no correlation? Can anyone help explain what this means? An example is "The amount of time spent in the bathtub and the temperature of the bath water." I am confused, thank you.
Monday, April 7, 2014 at 12:07pm

Bridge Math
The inequality 2003-09-04-00-00_files/i0280000.jpg models all of the combinations of scores of 20 and 30 points that will give a total greater than 400 points in a game. What is not true about the values for x and y?
Monday, April 7, 2014 at 12:02pm

Math (?)
It would help if you proofread your questions before you posted them. Insufficient data.
Monday, April 7, 2014 at 11:54am

math
We cannot help unless you state the specific problem.
Monday, April 7, 2014 at 11:48am

math
need help with math assessment lesson 7
Monday, April 7, 2014 at 11:19am

math-urgent
Sample space ={1,2,3,4,5} p(1)=0.1, p(2)=0.2 and p(3)=p(4)=0.05. Assume that A={1,3,5} and B={2,3,4}. Find p(5). Find p(A^c). I need help with this question. It is a probability question. please help.
Monday, April 7, 2014 at 10:49am

Math
Thinking of the doubling rate, we can see that after t hours, the population is P(t) = 50 * 2^(2t) = 50*4^t So, we want 50*4^t = 1000000 4^t = 20000 t log4 = log 20000 t = log20000/log4 = 7.14 hours
Monday, April 7, 2014 at 10:33am

Math
How about this pattern term(1) = 6 = 3(2^1) term(2) = 12 = 3(2^2) term(3) = 24 = 3(2^3) term(4) = 48 = 3(2^4) .... term(23) = .... = 3(2^23) term(n) = .....
Monday, April 7, 2014 at 8:04am

Math
6,12,24,48,96...... How can you define the nth term
Monday, April 7, 2014 at 7:51am

math
how about .15 * 63.00 = ?
Monday, April 7, 2014 at 4:39am

Statistics / Math
Calculate the standard deviation for: 10, 20, 30 to the nearest tenth presuming a sample
Monday, April 7, 2014 at 12:41am

Discrete Math
just make your usual Venn diagram and start labeling the intersections.
Monday, April 7, 2014 at 12:20am

businss math
c
Sunday, April 6, 2014 at 11:41pm

math
The wheelers' bill at a restaurant is $63.00.How much money should Mr.Wheeler leave as a tip 15%?
Sunday, April 6, 2014 at 11:35pm

Discrete Math
There are 150 students taking Discrete Mathematics II, Calculus II, and Physics I courses. Of these 51 are taking Discrete Mathematics II, 111 are taking Calculus II, and 63 are taking Physics I. There are 41 taking Discrete Mathematics II and Calculus II, 32 students taking ...
Sunday, April 6, 2014 at 11:29pm

Math age problem
James is 35 years older then chris. If chris 55 years old now, how old is chris
Sunday, April 6, 2014 at 10:51pm

Math
Thanks
Sunday, April 6, 2014 at 10:30pm

Math
2.7^3 = 19.683 15 * 19.683 = 295.245
Sunday, April 6, 2014 at 10:14pm

Math
The volume of the cylinder is 15 cubic inches. If all the dimensions are multiplied by 2.7 what is the new volume? My Answer- 295.245
Sunday, April 6, 2014 at 10:09pm

3rd Grade Math
solve a simpler problem
Sunday, April 6, 2014 at 10:01pm

algebra or math
Explain in words how to write an equation that is part one: parallel and then also part two: perpendicular to the equation y=2/3x-4 passing through the point (-2,-5). Write your answer in standard form.
Sunday, April 6, 2014 at 9:56pm

Math
I am sure you meant: Q(t) = 7000/(1 + 249 e^(-.6t) ) Q(10) = 7000/(1 + 249 e^(-.6(10) ) ) = appr 4328
Sunday, April 6, 2014 at 9:48pm

Math
Q(t) = 200 (1/2)^(t/14.2) or Q(t) = 200(.5)^(.0704t) Q '(t) = (200/14.2) (.5)^(t/14.2) so when t = 21.5 Q ' (t) = (200/14.2) (.5)^(21.5/14.2) = 4.931 g/day
Sunday, April 6, 2014 at 9:43pm

Math
we have already done a half life one but anyway ds/dt = k s ds/s = k dt ln s = k t + c when t = 0, ln si = c si is initial size ln s = k t + ln si ln (s/si) = k t s/si = e^kt 2 = e^k(30 min) ln 2 = 30 k k = .0231 1,000,000/50 = e^.0231 t ln (20,000) = .0231 t t = 428.6 = 429 ...
Sunday, April 6, 2014 at 9:34pm

math
P = Po(1+r)^n Po = $10,000 r = 8%/100% = 0.08 = APR expressed as a decimal. n = 1comp/yr. * 18yrs. = 18 Compounding periods. Solve for P.
Sunday, April 6, 2014 at 9:19pm

Math
Correction: c. % Grade = Slope expressed as a percentage.
Sunday, April 6, 2014 at 9:02pm

Math
.5 = e^-k T ln .5 = - k T T = -.693/-k = .693/k b) T = .693 / .0001074 = 6454 years
Sunday, April 6, 2014 at 9:01pm

Math
The growth rate of Escherichia coli, a common bacterium found in the human intestine, is proportional to its size. Under ideal laboratory conditions, when this bacterium is grown in a nutrient broth medium, the number of cells in a culture doubles approximately every 30 min. (...
Sunday, April 6, 2014 at 9:00pm

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...
Sunday, April 6, 2014 at 8:59pm

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?
Sunday, April 6, 2014 at 8:55pm

Math
A radioactive substance decays according to the formula Q(t) = Q0e−kt where Q(t) denotes the amount of the substance present at time t (measured in years), Q0 denotes the amount of the substance present initially, and k (a positive constant) is the decay constant. (a) ...
Sunday, April 6, 2014 at 8:54pm

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.)
Sunday, April 6, 2014 at 8:53pm

Math
During a flu epidemic, the number of children in the Woodbridge Community School System who contracted influenza after t days was given by the following. Q(t) = 7000/1+249 e−0.6 t (b) How many children had the flu after 10 days?
Sunday, April 6, 2014 at 8:52pm

Math
a. Y/X = Y/2.5 = 0.06 Y/2.5 = 0.06 Y = 0.15 Miles = 792 Ft. b. Y/X = Y/90 = 0.06 Y = 90 * 0.06 = 5.4 Miles = 28,512 Ft. c. % Grade = Slope expressed as a decimal.
Sunday, April 6, 2014 at 8:40pm

Math
I would consider it a "combination" , assuming that the order that you choose the appetizers should not matter Number of ways = C(4,2) x C(5,1) = 6x5 = 30
Sunday, April 6, 2014 at 8:16pm

MATH
A polynomial must have a non-negative integer exponent. A and B contain square roots or exponents of 1/2 D: 11/(√x)^2 = 11/x or 11 x^-1 so none is a polynomial C: x - √11 yup, I would go with that one
Sunday, April 6, 2014 at 8:10pm

math
P = Po(1+r)^n Po = $8500 r = (12%/4)/100% = 0.03 = Quarterly % rate expressed as a decimal. n = 1yr * 4comp/yr. = 4 compounding periods. Plug the above values into the given Eq and sole for P.
Sunday, April 6, 2014 at 8:03pm

MATH
Which expression is a polynomial???? A: 11 0ver the square root of x B: square root of 11 times x C: x - square root 11 D: 11 over the square root of x to the 2nd power (sorry I am not sure how to insert square root symbols or fractions, so u have to imaging its there) thank ...
Sunday, April 6, 2014 at 7:37pm

Math
Alex's favorite restaurant is a buffet-style Chinese restaurant downtown. Each time he goes, he chooses 2 appetizers and 1 entree. If the restaurant has four appetizers and 5 entrees to choose from, how many, times could Alex go to the restaurant without choosing the same ...
Sunday, April 6, 2014 at 7:20pm

math
cost is rate * distance. If the distance from home to A is x, then from home to B is 6-x. So, since the costs are the same, 50x = 75(6-x) 50x = 450-75x 125x = 450 x = 3.6 So, (C)
Sunday, April 6, 2014 at 7:15pm

math
You're welcome, Thomas.
Sunday, April 6, 2014 at 7:04pm

Math
since all dimensions are 1.6 times as big, the volume (multiplying all three dimensions) is increased y a factor of 1.6^3. 92 * 1.6^3 = ?
Sunday, April 6, 2014 at 6:55pm

math
thank you, Ms. Sue
Sunday, April 6, 2014 at 6:37pm

math
0.5x + 0.25x + 0.2x + 5000 = x 0.95x + 5000 = x 5000 = 0.05x 100,000 = x
Sunday, April 6, 2014 at 6:29pm

math
Mr. Benedict left half of his estate to his wife, one-fourth to his son, one-fifth to his daughter and the remainder, $5000 to his college. What is the total amount left by Mr. Benedict? a. $ 9,250 b. $ 10,000 c. $ 16,000 d. $ 50,000 e. $ 100,000 please answer and explain
Sunday, April 6, 2014 at 6:25pm

Math
http://www.google.com/webhp?source=searc​h_app#q=mathematical+concepts+string+art​
Sunday, April 6, 2014 at 6:25pm

Math
What are mathematical concepts are used to make string art?
Sunday, April 6, 2014 at 6:21pm

math
You're welcome.
Sunday, April 6, 2014 at 6:15pm

math
ok , thank you
Sunday, April 6, 2014 at 6:14pm

math
Cutting 2.5 inches from each end of the cardboard: 9 - 5 = 4 12 - 5 = 7
Sunday, April 6, 2014 at 6:13pm

math
why use 4 x 7
Sunday, April 6, 2014 at 6:02pm

math
4*7*2.5 = ?
Sunday, April 6, 2014 at 6:00pm

math
A rectangular piece of cardboard 9" x 12" is made into an open box by cutting a 2 1/2" square from each corner and bending up the sides. Find the volume of the box if no allowance is made for overlapping of the edges. a. 70 cu. in. b. 154 3/8 cu. in. c. 195 cu. ...
Sunday, April 6, 2014 at 5:50pm

Math
Please help!
Sunday, April 6, 2014 at 5:21pm

CHEMISTRY
.........A ==> 2B I....0.154.....0 C........-x....2x E...0.154-x....2x Substitute the E line into Kc expression and solve for x and 0.154-x. I don't know if the prof expects you to answer this with math (working out the above equation) or by reason but the math should ...
Sunday, April 6, 2014 at 5:14pm

Math
A triangular prism has a volume of 92 in.³ if all dimensions are multiplied by 1.6 what is the new volume?
Sunday, April 6, 2014 at 4:59pm

math
Yes! You're welcome.
Sunday, April 6, 2014 at 4:44pm

math
I understand now, like a triangle a^2 + b^2 = c^2 thank you
Sunday, April 6, 2014 at 4:42pm

math
Pythagorean Theorem: 40^2 + b^2 = 50^2 1,600 + b^2 = 2,500 b^2 = 900 b = 30
Sunday, April 6, 2014 at 4:35pm

math
Two stations, A and B, are located six miles apart on a railroad. The rates of cartage of coal are 50 cents per ton per mile from A and 75 cents per ton per mile from B. At a certain consumer's home, located on the railroad between A and B, the cost for cartage is the same...
Sunday, April 6, 2014 at 4:35pm

math
A 50 foot ladder is placed against a building so that it touches a point 40 feet above the ground. The distances ( in feet ) from the foot of the ladder to the building is a. 10 b. 20 c. 30 d. 45 e. 60 please answer and explain
Sunday, April 6, 2014 at 4:30pm

Math
there are only 3 colors, so the 4th sock must match one of the first three.
Sunday, April 6, 2014 at 4:19pm

Math
5000
Sunday, April 6, 2014 at 4:14pm

Math
You are about to leave for vacation, but you forgot your socks! You go back to your room but lights are out, can't see. You remember that in your draw you have 10 pair black, 10 pair white and 11 pair blue all mixed up. How many socks do you need to take out to be SURE you...
Sunday, April 6, 2014 at 4:00pm

Math (?)
Measure them with ruler or measuring tape? Insufficient data to answer second question.
Sunday, April 6, 2014 at 2:13pm

Math (Trigonometry)
secx + tanx = 3/2 secx = 3/2 - tanx sec^2 x = 9/4 - 3tanx + tan^2 x tan^2 x + 1 = 9/4 - 3tanx tanx = 5/12 so, sinx = 5/13 #2 is quite similar. tan^2 x + secx = 5 sec^2 x - 1 + secx = 5 sec^2 x + secx - 6 = 0 (secx+3)(secx-2) = 0 in QI, then, cosx = 1/2
Sunday, April 6, 2014 at 1:33pm

Math
well, just figure out the formula for the area: a = (w)(2w)(5w-15) for positive dimensions, w > 3 With no other restrictions, the range will be all positive real numbers.
Sunday, April 6, 2014 at 1:29pm

Math
1*1*C(6,2) = 15 extra credit: why did I multiply by 1 -- twice!? also, proofread before posting. I assume you meant the same topping can't be used twice for 1 pizza.
Sunday, April 6, 2014 at 1:23pm

Math
correct
Sunday, April 6, 2014 at 1:21pm

Math
1000000 people/66000 mi^2 = 1000/66 people/mi^2 That's a lot less than any of the proposed densities, so (A) assuming the cited figures actually apply to Florida...
Sunday, April 6, 2014 at 1:20pm

Math/Physics
when Tyson left at 11:00, Rashad had already gone 200km, so the two were 580 km apart. They approached each other at 180 km/hr, meaning they met in 3 2/9 hours. So, by the time they met at 2:13:20, Tyson had gone 257.8 km.
Sunday, April 6, 2014 at 1:18pm

Math
Please help
Sunday, April 6, 2014 at 12:51pm

math
20,002
Sunday, April 6, 2014 at 12:28pm

Math/Physics
Problem Question: Rashad started The 780km drive from Sault st. Marie to Ottawa at 09:00. His average speed was 100km/h. Two hours later Tyson left Ottawa for Sault St. Marie. He drove at 80km/h on the same highway. How far from Ottawa, and what time of day did they meet?
Sunday, April 6, 2014 at 12:26pm

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