Wednesday
August 24, 2016

Homework Help: Math

Branches of Math

Recent Math Questions

math
A 127 foot tower is located on hill that is inclined 38° to the horizontal. A guy wire is to be attached to the top of the tower and anchored at a point 64 feet downhill from the base of the tower. Find the length of wire needed.
Wednesday, June 1, 2016 by monene

math
1. The table shows the results of spinning a four-colored spinner 50 times. Find the experimental probability and express it as a decimal. P(not red) = ? red | blue | green | yellow ----------------------------------------​ 20 | 10 | 9 | 11 (1 point) a 0.6 b 0.4 c 0.2 &...
Wednesday, June 1, 2016 by Kawaii_potato

Math
The Big Bills are a charitable organization that conducts seven online contests with different combinations of prizes and entry costs. Arrange the contests in increasing order of what the chance to win should be so as to give a zero expected value to a player of that game. ...
Wednesday, June 1, 2016 by Habib

math
What is value of X ,if X^3=36.31*10^_24
Wednesday, June 1, 2016 by alaka

math
If w>4, which of the following has the smallest value? 4/w+2 w-1/4 w+1/w 4/w-1 w+2/4
Wednesday, June 1, 2016 by Anonymous Human

Math help plz??
i just need a little help...with this A radio signal travels at 3 x 10^8 meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of Earth if the satellite is orbiting at a height of 3.54 x 10^7?
Wednesday, June 1, 2016 by othilia....yes you prob know me...

math
The average summer temperature in Anchorage is 69°F. If the daily temperature is normally distributed with a standard deviation of 7°F, what percentage of the time would the temperature be between 55°F and 76°F?
Wednesday, June 1, 2016 by Habib

Samples and Predictions Math
Help please I really don't understand this! 1)Janine wishes to conduct a poll to predict how many students will vote for her for class president. Which polling methods are likely to be biased? Choose all answers that are correct. A. Five people in each of Janine’s ...
Wednesday, June 1, 2016 by Rochelle

math
A number cube is rolled 360 times, and the results are recorded as follows: 61 ones, 26 twos, 36 threes, 76 fours, 73 fives, and 88 sixes. What is the experimental probability of rolling a 2 or a 3? quick help
Wednesday, June 1, 2016 by jook

Math
Good morning! Could someone please help me with this problem? x:9=2/3:36 The answer is 0.1666 But this is what I keep getting: x/9 = (2/3)/36 x 36/36= (2/3) x (9/1) /36 (2/3) x (9/1) /36 = 6 6/36 = 6 Thank you in advance!
Wednesday, June 1, 2016 by Anonymous

math
if veronica took a test and she got 80% on it and she answered them correctly then how many questions were there?
Wednesday, June 1, 2016 by ellie

Math
a seller buys 8 oranges at $5 and sell 4 oranges at $5 ,what is the profit or loss percentage ?
Wednesday, June 1, 2016 by Dineth

Math- Prob Stat
The amount of time a student spends completing homework per week their senior year is normally distributed with a mean of 5 hours and a standard deviation of 1.4 A. Find the probability a randomly selected student spends less than 3 hours completing homework B. Find the ...
Wednesday, June 1, 2016 by Kate

math plz help ;-;
Assuming that the cone is completely filled with ice cream, which of the following equations below could be used to calculate the total volume of ice cream in the cone (before you start eating it!)? On top of the cone is 18 as the bottom is 26. A.V=π(9)^2(26)+(4/3)π(...
Wednesday, June 1, 2016 by leo

math plz help ;-;
A triangle has sides of lengths 5 cm, 5 cm, and square root 47cm. Which of the following statements is true? A. The triangle is an obtuse triangle because (√47)^2>5^2+5^2 B. The triangle is an acute triangle because 5^2<5^2+(√47)^2 C. The triangle is an acute...
Wednesday, June 1, 2016 by leo

math plz help ;-;
What is the equation of the line containing the two points (-4, 8) and (1, -7)? A.y=-3x B.y=3x+4 C.-3y=x-4 D.y=-3x-4 I need help with this Q i dont understand it can anyone show me step by step ;-; sorry
Wednesday, June 1, 2016 by leo

Math - system of eqns
Consider the system of equations: x1 + x2 + x3 = 6, −x1 − 2x2 + 3x3 = 1, 3x1 − 4x2 + 4x3 = 5. (a) Write down the augmented matrix for this system (b) Use elementary row operations to reduced the augmented matrix to reduced row-ecehelon form FOR A: Ive got: 1 ...
Wednesday, June 1, 2016 by Drake

math
Naron is learning for pre-second semester examination. He divides 8 hours per day for learning science, mathematics and literature with the ratio of 2 : 3 : 1. Find the number of hours he studies each major.
Wednesday, June 1, 2016 by dara

math plz help ;-;
Determine the x-coordinate of the solution of the system of equations below. You may use any method: 2x-y=10 x+y=2 Determine the y-coordinate of the solution for the system of equations. You may use any method. 2x-y=10 x+y=2 Plz help i really don't understand these two Q ...
Wednesday, June 1, 2016 by leo

Math-Calc
f(x)=7/(ln(x^2+5)) find f'(1) Cant seem to be getting the right answer. I believe can I get help finding the derivative.... thank you
Wednesday, June 1, 2016 by Jeff

math
Sara is lining a square tray with 1inch tiles. The side length of the tray is 9inches. How many tiles does Sara need?
Tuesday, May 31, 2016 by john

math plz check ;-; sorry
A triangle has sides of lengths 5 cm, 5 cm, and square root 47cm. Which of the following statements is true? A. The triangle is an obtuse triangle because (√47)^2>5^2+5^2 B. The triangle is an acute triangle because 5^2<5^2+(√47)^2 C. The triangle is an acute...
Tuesday, May 31, 2016 by leo

math
Find the experimental probability. Sheila drew single marbles from a bag, recorded the outcome, and replaced the marble. In 50 draws, Sheila drew 20 white marbles and 30 black marbles. What is the experimental probability that the next marble will be black? A.2/5 B.3/5 C.2/3 D...
Tuesday, May 31, 2016 by jose

Math
Let A1,A2...A12 be twelve equally spaced points on a circle with radius 1. Find (A1 A2)^2 + (A1 A3)^2 + ... + A11 A12)^2. (The sum includes the square of the distance between any pair of points, so the sum includes 12 choose 2 = 66 terms.)
Tuesday, May 31, 2016 by Archer

math
Let P_1 P_2 ... P_18 be a regular 18-gon. Show that P_1 P_10, P_2 P_13, P_3 P_15 are concurrent. I've proved this with a diagram, but the question requires a rigorous proof.
Tuesday, May 31, 2016 by Katie

Math
Suppose p and q are points on the unit circle such that the line through p and q intersects the real axis. Show if z is the point where this line intersects the real axis, then z=(p+q)/(pq+1) So far I've figured out that the equation for the line is z=p+t(q-p) but I don&#...
Tuesday, May 31, 2016 by Katie

math plz check ;-;
A triangle has sides of lengths 5 cm, 5 cm, and square root 47cm. Which of the following statements is true? A. The triangle is an obtuse triangle because (√47)^2>5^2+5^2 B. The triangle is an acute triangle because 5^2<5^2+(√47)^2 C. The triangle is an acute...
Tuesday, May 31, 2016 by leo

math
to determine whether a person has as thyroid deficiency, a radioactive iodine with a half-life of 8.2 days is injected into the bloodstream. a healthy thyroid is able to absorb all of the radioactivity. the amount, R, of radioactivity present after t days can be modeled by the...
Tuesday, May 31, 2016 by Alice

Math
1.what are the next three terms in the sequence? -6,5,16,27 A.38,49,60 B. 37,47,57 C.36,45,54 D.36,46,57
Tuesday, May 31, 2016 by Anonymous

math plz check ;-;
Order the following solids from least (1) to greatest (3) volumes. A rectangular pyramid whose base has an area of 60 in2 and whose height is 10 in. third A rectangular prism with a length of 6 in, a width of 5 in, and a height of 10 in. first A right cylinder with a diameter ...
Tuesday, May 31, 2016 by leo

Math
The perimeter of an isosceles triangle is four times the length of the shortest side. The longer sides are 4.5 feet longer than the shortest side. What is the length of each side of the triangle?
Tuesday, May 31, 2016 by Ty

Math(Please Help Assignment Due Today)
Four balances are shown where the two sides of each contain exactly the same amount of weight. The first balance has 4 squares, 1 triangle and 1 ball on the left side, right side has 2 diamonds. The second balance has 1 triangle and 1 square on the left side, 1 ball on the ...
Tuesday, May 31, 2016 by Heaven

Math
May has 36 bones and gave away 8 how many more bones dose she have for her dog?
Tuesday, May 31, 2016 by Amaya

Math
How many 250ml cups can I fill up if I have 250 liters of water?
Tuesday, May 31, 2016 by Sam

Math
Four balances are shown where the two sides of each contain exactly the same amount of weight. The first balance has 4 squares, 1 triangle and 1 ball on the left side, right side has 2 diamonds. The second balance has 1 triangle and 1 square on the left side, 1 ball on the ...
Tuesday, May 31, 2016 by Heaven

help my son's math
Sofia had 20 comic book and gave some of them to Heather.She uses a calculator to figure out that she gave away 0.15 of her comic book.How many comic book did she give to Heather!
Tuesday, May 31, 2016 by Kevin

Math ---HELP!!!!!
30% of the fifth grade students in a large school district read below grade level. The distribution of sample proportions of samples of 100 students from this population is normal with a mean of 0.30 and a standard deviation of 0.045. Suppose that you select a sample of 100 ...
Tuesday, May 31, 2016 by angela

Math
Sam has two cubes. The ratio of the side length of the two cubes is 2:3. What is the ratio of the volume of the two cubes?
Tuesday, May 31, 2016 by Sam

Math
John has closed square prism with a base of 36 square inches and a surface area of 360 square inches. Figure out its height?
Tuesday, May 31, 2016 by Sam

math
how to calculate manually (3.65)to the power 1/3or we cn say 3root over 3.65
Tuesday, May 31, 2016 by mallika

Math
Tom's online class requires 10 tests, and he needs to score 70 or higher to pass the class. He took 9 tests so far and his average is 68. What is the lowest score on the last test that will let him pass the course?
Tuesday, May 31, 2016 by Sam

Math(Reiny Please Help)
A qulliq is an oil lamp that functions as the main source of light and heat for an igloo in the Inuit culture. It is made of soapstone shaped as a parabolic bowl that contains seal blubber for the oil. It is lined with Arctic wool for the wick. If the length of the bowl is ...
Tuesday, May 31, 2016 by Heaven

Math(Reiny Please Help)
An explosives company specializes in bringing down old buildings. The time it takes for a particular piece of flying debris to fall to the ground can be modelled by the function h(t)= -12(t+2)^2 + 120(t+2), where h is the height of the debris in metres and t is the time in ...
Tuesday, May 31, 2016 by Heaven

math
a tank is 3/5 full ofwater 50 litre more required to fill it up. how many litres can tank hold..?
Tuesday, May 31, 2016 by jia

Math
(4x^2 - 2x-1) - (-3x^3 + 2)
Tuesday, May 31, 2016 by Frank

MATH
1) A cube has a side length of 7 in. What is the volume of the cube? MY ANSWER:21 2) A cube has a side length of 14 meters. What is the volume of the cube? A. 2744 m3 B. 1176 m3 C. 168 m3 D. 42 m3 MY ANSWER: D
Tuesday, May 31, 2016 by Rochelle

Math
Tom's online class requires 10 tests, and he needs to score 70 or higher to pass the class. He took 9 tests so far and his average is 68. What is the lowest score on the last test that will let him pass the course?
Tuesday, May 31, 2016 by Sam

math
A standard number cube with the numbers 1 through 6 is rolled. Find the probability of rolling a number greater than 4
Tuesday, May 31, 2016 by jook

math
The value of y is inversely proportional to the value of x. When y=42 x=6. What is the value of y when x=9
Tuesday, May 31, 2016 by Claire

Math ---HELP!!!!!
30% of the fifth grade students in a large school district read below grade level. The distribution of sample proportions of samples of 100 students from this population is normal with a mean of 0.30 and a standard deviation of 0.045. Suppose that you select a sample of 100 ...
Tuesday, May 31, 2016 by angela

Math
need help!!!!!!
Tuesday, May 31, 2016 by E

Math
At 10x10 grid can be used to represent hundredths. It can also represent percents. The world percent(%) means out of one hundred. For example, 50% means 50 out of one hundred. Step 1 Use a 10x10 grid to model the percent of tiles in the mosaic that are green. Step 2 In the ...
Tuesday, May 31, 2016 by Queeni

Math
Jackie is using 1-inch tiles to make the mosaic shown at the right. She needs a total of 100 tiles. What percent of the tiles are green? What do you know? What do you need to find?
Tuesday, May 31, 2016 by Queeni

Math
A rotating water sprinkler can spray water a distance of 15m. What area of grass can the sprinkler cover?
Tuesday, May 31, 2016 by Jill

math plz help ;-;
What is the y-coordinate of the y-intercept of the linear equation 2x - 3y = 12? Plz help I don't understand how to do this can you show me step by step plz, sorry ;-;
Tuesday, May 31, 2016 by leo

MATH
The decimal 4.25 is between which two integers? A. between -2 and +4 B. between -1 and +3 C. between -1 and +4 D. between -1 and +5
Tuesday, May 31, 2016 by Gracy

math
Find the cost of 3 notebooks and 1 magazine in terms of y, if the cost of 1 notebook is 2y and that of 1 magazine is (y+3) ?
Tuesday, May 31, 2016 by jasmine

math plz help ;-;
What is the equation of the line containing the two points (-4, 8) and (1, -7)? a.y=-3x b.y=3x+4 c.-3y=x-4 d.y=-3x-4 plz check if my answer is correct. My answer is c ^^;
Tuesday, May 31, 2016 by leo

Math
Anand bought a total of 30 white and brown pens for a total of Rs 32. The cost of each white pen is 70 paise more than the cost of each brown pen. Which of the following represents a possible value of the cost of each brown pen(in paise)?
Tuesday, May 31, 2016 by Anosh

Math - Vectors
Let the points A = (−1, −2, 0), B = (−2, 0, −1), C = (0, −1, −1) be the vertices of a triangle. (a) Write down the vectors u=AB (vector), v=BC(vector) and w=AC(vector) (b) Find a vector n that is orthogonal to both u and v. (c) Find a ...
Tuesday, May 31, 2016 by Drake

Math - Year 10 - Probability
A letter A, B or C is drawn from a hat and a random number that is either odd or even is obtained from a calculator. Can this question be solved? On a dot diagram or how can i represent this?
Tuesday, May 31, 2016 by ChaChing$

math help
which measure correctly completes the statement. 1,127.5 milligrams = ? grams (1 point)
Tuesday, May 31, 2016 by larry

Math
Me my friend have equal amount of collector cards. How many cards me and my friend have altgether
Tuesday, May 31, 2016 by Liyu

math plz check ;-;
Choose the correct graph for the linear equation 2x - 3y = 12. a.y=-3x b.y=3x+4 c.-3y=x-4 d.y=-3x-4 plz check if my answer is correct. My answer is c ^^;
Tuesday, May 31, 2016 by leo

Math
you accept a job with a salary of $35000 for the first year. suppose during the next 39 years you get a 5% raise each year. What is your total compensation if you work for a total of 40 years?
Monday, May 30, 2016 by Ginger

math
A boy wants to chop a log of wood into 10pieces.he takes 10 minutrs to cut one piece.how much time will he take to chop all 10 pieces
Monday, May 30, 2016 by mitali

math
for a triangular prism, the areas of the lateral faces are 18in^2, 26in^2 and 34in^2. if the area of the base is 16in^2, find the total area of the prism.
Monday, May 30, 2016 by kenzi

Math (Calculus)
Find the positive value of the parameter t corresponding to a point on the curve parametrized by {x= t^2 +3 ; y=t^2+t for which the tangent line passes through the origin. I tried with 2t+3 and 2t+1 but it isn't successful
Monday, May 30, 2016 by Anonymous

math
<TVY is congruent to <Z. also, TV=6, XZ=10 and YT=8. find TX.
Monday, May 30, 2016 by kenzi

Math Calculus I
let f(x)= 6sin(x)/(2sin(x)+6cos(x)) The equation of the tangent line to y= f(x) at a= pi/6 can be written in tthe form y=mx+b where m=? b=? I found the f': (9*(cos^2(x)+sin^2(x)))/(3cos(x)+sin(x))​^2 but i dont know how to fill it into the form. Can anyone help me? ...
Monday, May 30, 2016 by Anonymous

math
From an external point E, tangents ES and ET are drawn to circle O. if m<E=78°, find the measure of minor arc ST.
Monday, May 30, 2016 by kenzi

Math - volume about y axis
Find the volume generated by revolving the region enclosed above by the x-axis and the graph of the function f(x) = x^2 -1 about the y-axis. I cant make sense of it. What is it asking me to do? What are the integral bounds?
Monday, May 30, 2016 by Rob

Math ---HELP!!!!!
A researcher wishes to estimate the mean amount of money spent per month on food by households in a certain neighborhood. She desires a margin of error of $30. Past studies suggest that a population standard deviation of $248 is reasonable. Estimate the minimum sample size ...
Monday, May 30, 2016 by angela

Math..help
Multiply: (3a-(7/9))(3a-(7/9))
Monday, May 30, 2016 by Duran

Math ---HELP!!!!!
sample of nine students is selected from among the students taking a particular exam. The nine students were asked how much time they had spent studying for the exam and the responses (in hours) were as follows: 18, 7, 10, 13, 12, 16, 5, 20, 21 Estimate the mean study time of...
Monday, May 30, 2016 by angela

Math (Polar to Cartesian Equations)
Convert the given polar equation to a Cartesian equation. r^2=4sec(theta)csc(theta)
Monday, May 30, 2016 by Giovanni

math
You deposit $400 in a savings account that earns 7% interest compounded annually. What is the function that represents your balance after t years?
Monday, May 30, 2016 by Katie

Math help!
5. Replace the ___ with <, >, or = to make a true statement. 7^4/7^2____ 49 < <--------------- > = none of the above multiply the following polynomials. 6. –2r(8r + 5) –16r^2 + 5 <-------------- –16r^2 + 10 –16r^2 – 10r –16r^2 &#...
Monday, May 30, 2016 by Kate

math
in circle p, chord cd is 12 inches long and measure of arc cd=90°, find the exact area of the segment bounded by chord cd and arc cd.
Monday, May 30, 2016 by kenzi

Math
For questions 3 and 4, simplify each expression. 1. 4^4/4^6 -16 16 1/16 <----------------- -1/16 2. 5^0 0 <------------- 5 1 –5
Monday, May 30, 2016 by Annie

Math
Write each expression using a single exponent 1. x^9/x^2 a)x^11 b)x^7 <-------------- c)7 d)x^5 2. h^14/h^5 a)h^-9 b)1/h^9 c)h^19 d)h^9 <-----------------
Monday, May 30, 2016 by Annie

Math ---HELP!!!!!
A bag contains 4 red marbles, 3 blue marbles, and 7 green marbles. If a marble is randomly selected from the bag, what is the probability that it is blue? A. 2/11 B. 3/11 C. 5/14 D. 3/14 D
Monday, May 30, 2016 by angela

math plz help ;-;
Solve the following equation: -2(x-3)+4=8x-20 please help me how to do this step by step plz i do understand how to do this, sorry ;-; And thank you for the ones the helped me with the other Q :D
Monday, May 30, 2016 by leo

Math(PleaseHelpAssignmentDueToday)
Determine the y intercept of the graph of y=5x^2 + 7x+ 11
Monday, May 30, 2016 by Heaven

Math
The football team is on the 30-yd line and has 4 plays to make a rst down. To make a rst down, the team must advance the ball 10 yd. On the rst play, they lost 4 yd. On the second play, they gained 8 yd. On the third play, they lost 2 yd. How many more yards do the players ...
Monday, May 30, 2016 by Carey

math
Skip is practicing tennis serves against a wall. The distance between Skip and the tennis ball, in feet, at any time T, measured in seconds, is D(T)=-1.5|T-8|+9. which analysis of the formula is true? A. Skip is 9 feet from the wall and the ball will return to him in 1.5 ...
Monday, May 30, 2016 by stefan

Math
Lisa and Katie are playing a card game, and a total of 900 points has been scored. Lisa scored 400 more points than Katie. If you let l= l= the number of points that Lisa scored, and k= k= the number of points that Katie scored, then the problem can be represented by the system:
Monday, May 30, 2016 by Andy

math
the length of a rectangular garden is 4m more than its width determine the gardens width if the area is 117m^2
Monday, May 30, 2016 by jay

Math and science
How far apart are these two buildings?
Monday, May 30, 2016 by Lebo

Math
Where are the brackets supposed to be in this equatin 20-8÷2+6 to give 1. 5 as the answer.
Monday, May 30, 2016 by Hailey

Math
Kim throws her basketball up from the ground toward the basketball hoop from a distance of 20 feet away from the hoop. The ball follows a parabolic path and returns back to the gym floor 5 feet from the hoop. Write one possible equation to represent the path of the basketball...
Monday, May 30, 2016 by Harpreet

Math
There were 240 children in a school.60%of them were girls. How many girls were in the school
Monday, May 30, 2016 by Doireann

math
Hi, I have been trying to figure this one math problem for awhile and I am stuck. I believe the answer is between A or B. Skip is practicing tennis serves against a wall. The distance between Skip and the tennis ball, in feet, at any time T, measured in seconds, is D(T)=-1.5(T...
Monday, May 30, 2016 by Julia

Math
1. If you roll a number 52 times; how many times can you expect to roll a number 4? I do not understand Probability and a GEM test is coming up Thursday Please Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Monday, May 30, 2016 by Sam

Math
Many has two boxes one contains 10 colored pencils 4 of witch are red and 6 which are green the other box onther box contains 7 markers and which 4 are red and 3 are blue what's the probability of of many choosing green green pencil and red marker
Monday, May 30, 2016 by Frank

math
The road from the town of Wolford to the village of Abbotshead is measured as 5.8 cm on a map. If the scale of the map is 1:50 000, calculate the real distance between the 2 places in km
Monday, May 30, 2016 by Nikki

Math (pre-celc 12)
Write the expression as a single logarithm: 3log(a)-log(b)-(1/2)log(c) I want to check my answer. I got log(a^3/bc^(1/2))
Monday, May 30, 2016 by Jana

algebra 1
NEED HELP!!Hi, I have been trying to figure this one math problem for awhile and I am stuck. I believe the answer is between A or B. Skip is practicing tennis serves against a wall. The distance between Skip and the tennis ball, in feet, at any time T, measured in seconds, is ...
Monday, May 30, 2016 by david

Math
1. Identify the following functions as linear or nonlinear: xy = -9 y = 3x x + 7 = y y = x - 4 y = x^2 x + y - 20 = 2x 1/2x = y y = 5/x y = 30 - x^2 thank you
Monday, May 30, 2016 by I NEED HELP MS SUE

Math
Hi, I have been trying to figure this one math problem for awhile and I am stuck. I believe the answer is between A or B. Skip is practicing tennis serves against a wall. The distance between Skip and the tennis ball, in feet, at any time T, measured in seconds, is D(T)=-1.5(T...
Monday, May 30, 2016 by Ann Mori

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