Friday
September 4, 2015

Homework Help: Math

Branches of Math

Recent Math Questions

math
PLACE 8 COUNTERS IN GROUPS OF 4
Monday, June 1, 2015 by amelia

math
How many mls of 45% dextrose and 15% dextrose do you need to make 780 mls of 35% dextrose
Monday, June 1, 2015 by Brian

Math
How many real number solutions does the equation have? y=3x^2-5x-5 A)one solution B)two solutions C)no solutions D)infinitely many solutions I can't figure this question out. Any help would be amazing.
Monday, June 1, 2015 by Sasha

Math (check answers)
Since the opening night, attendance at Play A has increased steadily, while attendance at Play B first rose and then fell. Equations modeling the daily attendance y at each play are shown below, where x is the number of days since the opening night. On what day(S) was the ...
Monday, June 1, 2015 by Sasha

Math (check answers)
1)Identify the sampling method. You want to determine the number of text messages students at your school send in a month. You go to the cafeteria and randomly ask students as they come out of the lunch line. A)Random*** B)Systematic C)Stratified D)None of these. Would the ...
Monday, June 1, 2015 by Sasha

Math (check answers)
1)What is the simplified form of the expression? 5d^6*d^-12? A)5d^-72 B)6d^-72 C)5d^-6**** D)6d^-6 I think that the answer is C. If anyone could tell me if I am correct that would be great.
Monday, June 1, 2015 by Sasha

Math
What is the volume of the right prism? 15in 17in 10in 8in a. 1200 in3 b. 600 in3 c. 400 in3 d. 50 in3 What is the circumference of the circle? Use pie = 3.14. Round your answer to the nearest tenth of a centimeter. 17 cm A.20.1 cm B. 26.7 cm C.34.0 cm D. 53.4 cm Can someone ...
Monday, June 1, 2015 by Gigi

math
A right cylinder has a diameter of 30 mm and a height of 30 mm, as shown. What is the volume of the cylinder? a. 27,000 mm3 b. 21,195 mm3 c. 2826 mm3 c. 1413 mm3 How do I do this?
Monday, June 1, 2015 by Gigi

math
8! / 4! = 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 = 40320 1 x 2 x 3 x 4 = 24 40,320 / 24 = 1680 A.1680 <--- B.336 C. 24 D.2 Am I correct
Monday, June 1, 2015 by Gigi

math
Ms. Washington has 18 students in her class. She wants to send 3 of her students to pick up books for the class. How many combinations of students can she choose? 816 54 306 4896 I'm not sure if its A?
Monday, June 1, 2015 by Gigi

Math
A jar contains 14 nickels, 10 dimes, 6 quarters, and 22 pennies. A coin is chosen at random from the jar. What is the probability that the coin chosen is a dime? Option A: 5/21 Option B: 1/21 Option C: 5/26 Option D: 1/26
Monday, June 1, 2015 by Gigi

Math
If f(x) = 0.5(2 x), what is the value of f(2)? A. 0 B. 0.5 C. 2 D. 4.5 please help me.
Monday, June 1, 2015 by Gigi

Math
3. A fish and game warden captures and tags 66 deer in a local forest. A month later he captures 100 deer and that 17 of them are tagged. Estimate the actual number of deer in the forest. A) 149 B)1,022 C) 578 D) 389*** 4. Lucy wants to find out the number of frogs in a pond ...
Monday, June 1, 2015 by Not giving my name just so Connexus cant find me

math
How many mls of 55% Dextrsoe and water do you nee to make 980 mls of 27.5 Dextrose? No clue on what to do.
Monday, June 1, 2015 by Brian

Math Algebra 1111
If the domain of a function F is the set of all real numbers and the domain of a function G is the set of all real numbers, under what circumstances do (F+G)(x) and (F/G)(x) have different domains? Whenever G(x) = 0 then the domains would differ. For example, if F(x) =x+2 and ...
Monday, June 1, 2015 by GNTC

Math
Austin and Tamara each completed the square of the quadratic equation 0=3x square - 15x + 6 Austin 0=3(x-5/2) square-51/4 Tamara 0=(x-5/2)square-17/4 Who is correct and show why
Monday, June 1, 2015 by Elijah

math
If 4 is subtracted from ones digit of two digit number and 4 is added to tens digit the resulting no. Is doubled. Find the number
Monday, June 1, 2015 by aaryan

Math
Create a finite-state machine which accepts strings whose characters are in {a, b, c} and produce output strings of T s and F s. The machine outputs a T once the character pair ab (the characters must be adjacent) is encountered in the string. Before this occurrence, it should...
Monday, June 1, 2015 by Excel

Math
simplify: cos(sin^-1(x)) Can someone please show a step by step of how to do this.
Monday, June 1, 2015 by Galagan

Math
prove: sec^2(x)=1+tan^2(x)
Monday, June 1, 2015 by Alex

DISCRETE MATH
We have a relation R on Z+ defined as follows: mRn if and only if m|n. Determine the set B = {n ∈ Z|52Rn}. Thanks
Monday, June 1, 2015 by Anonymous

Math
Can someone please help me with piecewise functions. I know what they are but when it gets to advanced i have ttrouble. s(x)= /x-2/ + /x-3/ + /x+1/ (/ / = 'modulus') Write as a piecewise defined function. Have no idea tbh. Thanks
Monday, June 1, 2015 by Alex

lotto math equation
winning85.40.51.26.2.machine 74.37.50.38.53.what will be first fivenumbers
Monday, June 1, 2015 by yunmuh

DISCRETE MATH
We have a relation R on Z+ defined as follows: mRn if and only if m|n. a. Explain why the relation R is not a function. b. Determine the set A = {m ∈ Z|mR52} and give its cardinality |A|. c. Determine the set B = {n ∈ Z|52Rn}. d. Indicate whether A ∩ B = &#...
Sunday, May 31, 2015 by Anonymous

8th grade math
A rubber ball loses 30% of its height each A rubber ball loses 30% of its height with each bounce How high is the first bounce if the ball is dropped from a height of 500 cm?
Sunday, May 31, 2015 by Carlos

Math
Suppose you have a mean standardized score of 1500 points with a standard deviation of 150 points. This data is normally distributed. What is the z-score of 1600 points? 0.75 0.5 0.67 0.32
Sunday, May 31, 2015 by Destiny

Math
The time required to finish a test in normally distributed with a mean of 40 minutes and a standard deviation of 8 minutes. What is the probability that a student chosen at random will finish the test between 24 and 48 minutes? 82% 2% 84% 16%
Sunday, May 31, 2015 by Destiny

Math
Christine's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Christine $5.85 per pound, and type B coffee costs $4.40 per pound. This month, Christine made 174 pounds of the blend, for a total cost of $906.25. How many pounds of type ...
Sunday, May 31, 2015 by John

Math
This is a question regarding quadratic equations. I think I have to use the quadratic formula but I'm not sure and because the question provides the base I think I'm wrong. Here is the question|: During a hurricane, parabolic waves on the ocean can exceed a height of ...
Sunday, May 31, 2015 by Brady

DISCRETE MATH
Let Z 5 be the relation of congruence modulo5. If 1 ≤ m, n ≤ 5,we define the product of two classes as [m][n] = [mn]. Explain why [3][4] = [2]. I know 3 x 4 = 12. 5 mod 12 = 2. but i don't know how to explain it. Help with the explanation please. Thanks
Sunday, May 31, 2015 by Anonymous

DISCRETE MATH
Let Z 5 be the relation of congruence modulo5. If 1 ≤ m, n ≤ 5,we define the product of two classes as [m][n] = [mn]. Explain why [3][4] = [2]. Thanks
Sunday, May 31, 2015 by Anonymous

Math
you have 1/2 of a brownie. You eat 3/4 of what you have , what fraction of the brownie did you eat?
Sunday, May 31, 2015 by Alisha

Math
A hot air balloon with a height of 120m is directly over a bridge that is 313m from the balloon's landing point. The navigator finds the angle of depression to the landing point. Find the angle of depression.
Sunday, May 31, 2015 by Shawn

Math
What is the maximum volume of a cone that would fit in the box with h=3cm, l=6cm, and w=3cm? how do i do this step by step
Sunday, May 31, 2015 by Albert Einstein

math
What number is the sum of 8 numbers whose average is 13
Sunday, May 31, 2015 by lily

Math
Hello! Could someone please take a look at the problem below and let me know if I made mistakes in simplifying the given equation? I'm quite certain that I did make a mistake somewhere because the original equation and its simplified form give different graphs when plotted...
Sunday, May 31, 2015 by Constantine

Math (Statistics)
Without calculating values of z, tell which of these sample means will have the most extreme standardized score and which will have the least extreme standardized score. 40, 30, 25, 20.
Sunday, May 31, 2015 by Debbie

math
What is the solution to the following equation? 3x(x-4)+5=12
Sunday, May 31, 2015 by charlie

math
find two irrational numbers lying between root of 2 and root of 3
Sunday, May 31, 2015 by vikash goyal

math
find a and b for the following:- 1).(root of 2+root of 3 / 3 root of 2 - 2 root of 3) = a+b root of 6 2). {(root of 5 - 2/root of 5+2)-(root of 5+2/root of 5 - 2)} = a+b root of 5
Sunday, May 31, 2015 by vikash goyal

Math
The surface area of this hemisphere is 1062 cm^2. what is its radius? please help me calculate this step by step
Sunday, May 31, 2015 by Albert Einstein

Math
Find the 100th term in the sequence 77, 71, 65, 59 How do you go about doing this question without the need to list them all out?
Saturday, May 30, 2015 by Maria

Math
What is the units digit of 7^42 . I know I can just plug it in a calculator, but what is a faster way
Saturday, May 30, 2015 by Maria

Math
Find the 100th place to the right of the decimal point in the decimal expansion of 1/13.
Saturday, May 30, 2015 by Maria

Math
Which system has an infinite number of solutions? A.{x+2=y 4=2y-x B.{2y+6=4x -3=y-2x C.{y+3=2x 4x=2y-3 D.{y=2x-5 -2=y-2x Is it B
Saturday, May 30, 2015 by M

Math
Patton is organizing his stamp collection into ab ook. He has 42 foreign stamps and 70 US stamps. He wants every page to have the same number of foreign stamps and the same number of US stamps. If he puts the greatest number of stamps on each page, how many pages will he use? ...
Saturday, May 30, 2015 by M

Math help please thank you
Chris needs to make 500 L of a 35% acidic solution. He has only two of the acidic solutions available, a 25% solution and a 50% solution. How many litres of each acidic solution should he mix?
Saturday, May 30, 2015 by Anonymous

Math
Which equation has the same slope as y=4x-5 A.4x-2y=0 B.3y-12x=21 C.y=5x+7 D.5y=4x-6
Saturday, May 30, 2015 by M

Math
Y=3x and Y=1/3x Is this perpendicular?
Saturday, May 30, 2015 by M

Math
how to determine if something is a function besides the statement "x's cannot repeat"
Saturday, May 30, 2015 by M

Math
An item that sells for $145.99 has a sales tax of 10.22 Find a mathematical model that gives the amount of sales tax y in terms of the retail price x Use the model to find the sales tax on a purchase that has a retail price x
Saturday, May 30, 2015 by Jasmine

Math word problem
George has 21 coins with a total value of $12.75. He knows he only has quarters and dollar coins in his pocket. How many coins of each type does he have? Create a system to solve.
Saturday, May 30, 2015 by Anonymous

math
A textbook search committee is considering 20 books for possible adoption. The committee has decided to select 5 of the 20 for future consideration. In how many ways can it do so?
Saturday, May 30, 2015 by Chris

Math
How do I solve this using the substitution method? x+3y=8 3x-2y=2
Saturday, May 30, 2015 by Anonymous

Math
If 7 1/4 boxes of parts weigh a total of 68 7/8 pounds, what does one box of parts weigh?
Saturday, May 30, 2015 by Joshua

Math please help!!
An engineer sees that the angle of elevation to a vertical tower is 45 degrees. When he moves 40 feet closer to the tower on the same straight, level path, he sees that the angle of elevation becomes 55 degrees. How tall is the tower?
Saturday, May 30, 2015 by math

Math ASAP PLZ :)
if you were to create a histogram of the data in the frequency table, which interval would have the shortest bar? a. 8-9 b.10-11 c.16-17*** d.18-19
Saturday, May 30, 2015 by Hazel Grace

Math, help plz
if you were to create a histogram of the data in the frequency table, which interval would have the shortest bar? a. 8-9 b.10-11 c.16-17*** d.18-19
Saturday, May 30, 2015 by Hazel Grace

math
If the offer was changed to "Buy 3, Get 2 Free," at $8.99 each, what would be the new markdown percent? Round to the nearest tenth and do not enter the percent symbol in your answer.
Saturday, May 30, 2015 by kathy

Math please help!!
A parallelogram has adjacent sides of 78 inches and 90 inches, and the angles between them is 35 degrees. Find the length of each of the diagonals.
Saturday, May 30, 2015 by sadie

math
Baseball has total 15 games and they win 3/8 game how many game did they win?
Saturday, May 30, 2015 by Anonymous

Math
A parallelogram has adjacent sides of 78 inches and 90 inches, and the angles between them is 35 degrees. Find the length of each of the diagonals.
Saturday, May 30, 2015 by sadie

math
An engineer sees that the angle of elevation to a vertical tower is 45 degrees. When he moves 40 feet closer to the tower on the same straight, level path, he sees that the angle of elevation becomes 55 degrees. How tall is the tower?
Saturday, May 30, 2015 by sadie

math
An Artisan has 63 kg of metal of density 7,000kg/m3. He intends to use make a rectangular pipe with external dimensions 12 cm by 15 cm and internal dimensions 10 cm by 12 cm. Calculate the length of the pipe in meters.
Saturday, May 30, 2015 by Nasirinho

math
if x = 1-squareroot of 2, find the value of (x-1/x)power of 3
Saturday, May 30, 2015 by vikash goyal

math
simplify 1/(1+square root of 2) + 1/( square root of 2 + square root of 3) + 1/(square root of 3 + square root of 4)
Saturday, May 30, 2015 by vikash goyal

math
if x = 1-square root of 2, find the value of (x - 1/x) power of 2
Saturday, May 30, 2015 by vikash goyal

math
if x= 3+2^2, find the value of (^x - 1/x)^2
Saturday, May 30, 2015 by vikash goyal

math
What is the solution to the inequality |2n+5|>1? A. –3 > n > –2 B. 2 < n < 3 C. n < –3 or n > –2 D. n < 2 or n > 3 I put A! :) Thank you again.
Friday, May 29, 2015 by :)

math
Which inequality is equivalent to |x-4|<9? A. –9 > x – 4 < 9 B. –9 < x – 4 < 9 C. x – 4 < –9 or x – 4 < 9 D. x – 4 > –9 or x – 4 < 9 I put B?
Friday, May 29, 2015 by :)

MAth
What should you say when you meet an angel
Friday, May 29, 2015 by Hellen

Math
you drive 12,000 miles per year and use 343 gallons of unleaded gasoline. What is your monthly cost of gasoline? my answer: $478.49
Friday, May 29, 2015 by John Dosley

Math
Joan bought a sweater at a 1/4 off sale. The regular price of the sweater was $37.50. How much did joana pay for the sweater? My Answer: $28.14 is what she had paid for the sweater.
Friday, May 29, 2015 by John Dosley

MATH
Karl bought a tennis racket at a 1/3 off sale. the regular price of the racket was $45.75. how much did karl pay for the racket? My answer: $30.65 is what Karl paid for the racket, am i right?
Friday, May 29, 2015 by John Dosley

Math
A thermos holds 1 1/4 quarts of water. How many thermoses can be filled with 5 quarts of water? My Answer: 6 1/4 am i right? i just multiplied 1 1/4 and 5 to get 6 1/4.
Friday, May 29, 2015 by John Dosley

Math
An airplane takes 5 3/4 hours to reach its destination and 4 1/2 hours to return. If the plane was on the ground for 1 1/4 hours, what was the total time the plane was gone? My answer is 11 1/2 hours, i just added all three numbers am I right?, or was I just supposed to add ...
Friday, May 29, 2015 by John Dosley

Math
(2y-3)(3y-2) A. 6y2-13y+6 B. 6y2-13y-6 C. 6y2+13y-6 * D. 6y2+13y+6 *my answer (btw the 2 next to 6y is an exponent) I think that it is C, but I want to be sure that it is correct.
Friday, May 29, 2015 by Haley

math
Samuel is 1/2 as old as his brother. In seven years, he will be 2/3 as old as his brother will be. Find their present ages. Show each step of your work.
Friday, May 29, 2015 by Hawk Cleary

Math
1. Write the coordinates of point K. A. (6,-1) B. (-1,6) C. (-6, 1) D. (1,-6)
Friday, May 29, 2015 by DRAGON

Math/ASU
A movie theater sold a total of 520 adult and child tickets on a certain day. The theater sold 2.25 times as many adult tickets as child tickets. Each adult ticket cost $9 and each child ticket cost $2. How much revenue did the theater generate in ticket sales that day?
Friday, May 29, 2015 by Stephenie H

Algebra/Math
Write an inequality to represent the situation: The temperature stayed above -15*. I've already done this test, but I'm doing corrections. Please help? I'm thinking that the -15* is <=.
Friday, May 29, 2015 by Mikasa Ackerman

math
Sarah has a piece of rope that is 10 ft long. She wants to cut it into 2 pieces so that the longer piece is 2 ft less than 3 times the shorter piece. How many ft long will the shorter piece be?
Friday, May 29, 2015 by larassia

math
find the equation of a circle whose diameter has ends points A=(-4, 3)and B=(5, 7)and it subtends a 90 degree at the circumference.
Friday, May 29, 2015 by cyrus

math
Bruce scored a 12, 18, 16, and 17 on his four quizzes. What must his score on the fifth quiz be if he wants an overall average of 16.
Thursday, May 28, 2015 by Kimberlyn

Algebra
Explain how to use mental math to simplify the expression. a.) 8 * 3 * 2 b.) 8 * 2 + 3 c.) 5 + 8 + 3 d.) 10 * 3 -4 I have to explain the process. Example: Using the associative property of multiplication I can group 8*(3*2) so I get 8*6. Then I multiply 8*6 which is 48.
Thursday, May 28, 2015 by Anon

math
Consider the distribution of mathematics SAT scores of students in honors calculus at a liberal arts college. What would you expect the shape and variation of the distribution to be? A. Symmetric with little variation B. Symmetric with large variation C. Skewed right with ...
Thursday, May 28, 2015 by scoobs2usa

Math
A bag contains tiles with the letters -C-O-M-B-I-N-A-T-I-O-N-S. Lee chooses a tile without looking and doesn't replace it. He chooses a second tile without looking. What is the probability that he will choose the letter O both times? A) 1/132 B) 1/72 C) 1/66 D) 1/23 Is the...
Thursday, May 28, 2015 by STUdent

math
A bird is flying southward at a rate of 480 mph. There is an east wind blowing at 60 mph. What is the new speed and direction of flight of the bird?
Thursday, May 28, 2015 by jim

Math
For each quadratic function, find the axis of symmetry of its graph. y=3x^2-6x+4
Thursday, May 28, 2015 by Makaila

Math
I have a practice math test and I am stuck on a few. Please help :-) 1) Write the number of permutations in factored form. Then simplify. How many different ways can you and four of your friends sit in the back of a limousine? A) 4!; 24 B) 4!; 120 C) 5!; 120 D) 5!; 720 2) ...
Thursday, May 28, 2015 by Kylie

Algebra
Explain how to use mental math to simplify the expression. a.) 8 * 3 * 2 b.) 8 * 2 + 3 c.) 5 + 8 + 3 d.) 10 * 3 -4 I have to include what properties (associative, distributive etc.) I used to simplify the problems.
Thursday, May 28, 2015 by Anon

Math
If each box costs the same amount to ship, which would be more cost effective? Hint: Which has a greater volume? They are rectanglur prisims Box 1: 4ft 3ft 2ft Box 2: 2.5 ft 5ft 2ft
Thursday, May 28, 2015 by Lilly

Math
Q. Coles sleeping bag has four sides. The side with the zipper is parallel to the opposite side. None of the angles where the sides meet are right angles. The side opposite the zipper is shorter than the side with the zipper. The other two sides are the same length. What shape...
Thursday, May 28, 2015 by Abbey

Math
Q. Tim and Jorge hope they will be assigned to the same cabin at the summer camp. Each cabin has 8 beds in it. And Tim knows that he is saying in the green cabin not the red cabin. If there are 14 boys going to camp in addition to Tim and Jorge. What is the change that Tim and...
Thursday, May 28, 2015 by Abbey

math
3x2+5x-5x2-4x+5-2
Thursday, May 28, 2015 by ciara

Math
Hi I'm trying to do my graph and the numbers go from 50 100 150 200 250 300 there is a point missing between 200 and 250. How do I find the number between 200 and 250?
Thursday, May 28, 2015 by Lilly

Math
Q. Tim and Jorge hope they will be assigned to the same cabin at the summer camp. Each cabin has 8 beds in it. And Tim knows that he is saying in the green cabin not the red cabin. If there are 14 boys going to camp in addition to Tim and Jorge. What is the change that Tim and...
Thursday, May 28, 2015 by Michelle

Math
tracy invested $6000 for one year, part at 10% annual and the balance at 13% annual interest. her total interest for the year was $712.5. how much money did she invested at each rate? I tried using a table for this I just don't know how to set the problem up.
Thursday, May 28, 2015 by Makasta

MATH
0.4771=x/2.303*8.14[50/323*373 calc.-x?
Thursday, May 28, 2015 by tanya

Math
The area of a rectangle is 42m2.If its length is 5m, what is its breadth?
Thursday, May 28, 2015 by Shandy

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