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March 30, 2015

March 30, 2015

**Branches of Math**

**Recent Math Questions**

Post a New Question | Current Questions

**math**

write two consecutive perfect square closest to 20. estimate the value of square 20 . square your estimate. use this value to revise your estimate. keep revising your estimating until the square of the estimate is within 1 decimal place of 20. my eng is limited, can anyone ...
*Wednesday, February 4, 2015 at 3:47pm*

**math**

Below are two pairs of points. A line goes through each pair of points. What are the coordinates for the intersection of the two lines? Show your work. Pair 1 (1,1) and (7,7) Pair 2 (0,8) and (8,0)
*Wednesday, February 4, 2015 at 2:41pm*

**math lit, geography, life science,business studies**

hey there! what career can do with math lit, geography, life science and business studies?
*Wednesday, February 4, 2015 at 1:51pm*

**~MATH~**

***Check Answers Plz*** 1)suppose the total momentum of two masses before a collision is 100 kg m/s.what is the total momentum of the two masses after they collide? a~0 kg m/s b~50 kg m/s c~100 kg m/s****(My answer) d~200 kg m/s 2)What is the momentum of a 20.0 kg scooter ...
*Wednesday, February 4, 2015 at 1:27pm*

**Math**

I have 14 hundreds, 16 tens and 9 ones. What number am I?
*Wednesday, February 4, 2015 at 1:10pm*

**math**

18 children are present in class, 1/4 are absent. How many children are there in the class altogether?
*Wednesday, February 4, 2015 at 1:00pm*

**math**

mr. goggins planted 10 rows of beans, 10 rows of squash, 10 rows of tomatoes, and 10 rows of cucumbers in his garden. he put 22 plants in each row. draw an area model, label each part, and then write an expression that represents the total number of plants in the garden.
*Wednesday, February 4, 2015 at 12:49pm*

**math**

which variable is usually associated with the concept of output
*Wednesday, February 4, 2015 at 12:46pm*

**Math**

whats the standard form of a linear equation?
*Wednesday, February 4, 2015 at 12:34pm*

**math**

Which of the following homogeneous systems have a nontrivial solution? 5x+ y + 5z =0 −2x + 2y− 4z = 0 4x− 3y + 6z = 0 can someone please explain how you know
*Wednesday, February 4, 2015 at 11:55am*

**math**

For what value of n, are the nth terms of two APs: 63,65,67,...and3,10,17,...equal?
*Wednesday, February 4, 2015 at 8:30am*

**math**

A solid cone of height 12cm and radius 9 cm is recast into a solid sphere. Calculate the surface area of the sphere. cone V= 1/3 pi r^2 h sphere V= 4/3 pi r^3 area of sphere = 4r^2 how to find sphere of radius?
*Wednesday, February 4, 2015 at 2:16am*

**math**

Let A and B be events such that P(B)=0.28, P(B|A) =0.44 and P(A or B)=0.63, What is P(A)
*Wednesday, February 4, 2015 at 1:56am*

**math**

I have a bag that contains 10 red marbles, 9 green marbles, and 6 blue marbles. I reach into it and take one marble at random. Keeping that marble, I reach into the bag again and take a second marble at random. a. What is the probability that the first marble is green and the...
*Wednesday, February 4, 2015 at 1:47am*

**Math**

What does vitally mean?
*Tuesday, February 3, 2015 at 11:17pm*

**math **

Find a number b such that f∘g=g∘f, where f(x)=3x+4 and g(x)=bx−4. b=
*Tuesday, February 3, 2015 at 11:16pm*

**math **

Suppose you are exchanging currency in the London airport. The currency exchange service there only makes transactions in which one of the two currencies is British pounds, but you want to exchange dollars for Euros. Thus you first need to exchange dollars for British pounds...
*Tuesday, February 3, 2015 at 11:13pm*

**Math-ratios**

Ed, bob, and sue want to share 24 crackers. They each get 8. Bo comes along and they want to share with him too. Now they each get 6. A. what is the ratio of people? I think 3:4 B. What is the ratio of crackers? I think 8:6 or 4:3simplified. C. Explain how these two ratios are...
*Tuesday, February 3, 2015 at 11:06pm*

**Math**

Draw a velocity vector to represent the following (1cm represents 10km/h): a) a girl running around a circular track travelling at 15km/h heading due east. In the solutions, it shows it heading south, why is that?
*Tuesday, February 3, 2015 at 10:59pm*

**math**

Lucy has 40 bean plants,32 tomato plants,and16 peppers plants.She wants to put the plants in rows with only one type of plant in each row.All rows will have the same number of plants.How many plants can Lucyput in each row
*Tuesday, February 3, 2015 at 10:55pm*

**Math-ratios**

Mary saved $44. On Thursday, she spent $7 of her savings. what ratio represents the portion of her total savings that she still has? I know she has $37 left but I don't understand what ratio it would be.
*Tuesday, February 3, 2015 at 10:46pm*

**Math - Operations with Algebraic Vectors**

If a = 3i + 2j and b=-2i+j calculate |a+b| a and b are vectors and i and j have the arrow pointy thing above it instead of the dots. The correct answer is square root 11. So, what I did was substitute a + b with the equations: =(3i+2j-k)+(-2i+j) =i+3j-k Now I'm stuck and ...
*Tuesday, February 3, 2015 at 10:41pm*

**Math **

Vector AB whose tail is at (-4,2) and whose head is at (-1,3). Calculate the magnitude of Vector AB.
*Tuesday, February 3, 2015 at 10:38pm*

**math metric unit**

A box of hot cocoa packets has 30 grams of hot cocoa mix. How many boxes of mix can be made from 6 kilograms of hot cocoa mix.
*Tuesday, February 3, 2015 at 10:35pm*

**math comparing fractions**

James says that 5/5 is greater than 9/10 is he correct
*Tuesday, February 3, 2015 at 10:20pm*

**math**

The velocity V ms^-1, of a moving body at time t seconds is given V = 5t^2 – 12t + 7 Calculate the acceleration when t = 2 seconds
*Tuesday, February 3, 2015 at 10:11pm*

**math**

Given that OA = 3i – 2j + k and OB = 4i – j – 3k. Find the distance between points A and B to 2 decimal places.
*Tuesday, February 3, 2015 at 10:10pm*

**Math (PreCalculus)**

How do I prove the following identity? sec^2x-1 (division line)> -------- = (tanx)(secx) (sinx)
*Tuesday, February 3, 2015 at 9:21pm*

**math**

You have 15 pennies in your pocket, 3 are Canadian. You pick aenny out of your pocket at random. FInd p (not Canadian)
*Tuesday, February 3, 2015 at 9:07pm*

**MATH**

THE FIRST AND LAST TERMS OF AN ARITHMETIC SERIES IS 5 AND 61 RESPECTIVELY WHILE THE SUM OF ALL THE TERMS IS 957. DETERMINE THE NUMBER OF TERMS IN THE SERIES.
*Tuesday, February 3, 2015 at 9:07pm*

**Math: Intro to Vectors**

Left side = right side check type of question. x - (x + y)/2 = (x - y)/2 What I did was times the x in the left side by 2. I got: =(2x-x+y)/2 which equals =(x+y)/2 But the left side is (x-y)/2. What am I doing wrong?
*Tuesday, February 3, 2015 at 9:05pm*

**Math**

4x-2y=7 3x+6y=9 Please help me solve this system by multiplying
*Tuesday, February 3, 2015 at 9:04pm*

**math (geometry)**

does anyone know how to do inscribed angles????????????............!!!!!!!!!!!
*Tuesday, February 3, 2015 at 8:54pm*

**math (geometry)**

find the value of each variables
*Tuesday, February 3, 2015 at 8:45pm*

**Math( PLease help Ms. Sue)**

Use the figure shown to complete each of the following questions. 1. ∠QTR and ______ are complementary. ∠QTS ∠RTS ∠PTN ∠QT 2. ∠QTN and _____ are supplementary. ∠QTS ∠QTP ∠RTS ∠PTR 3. If ∠PTQ measures 29°, ...
*Tuesday, February 3, 2015 at 8:11pm*

**Math**

Identify the solid formed by the given net. The middle and a triangle on each edge of the middle triangle. A. Triangular prism B. Triangular pyramid C. Cone D. Triangle Is the answer B? Thank you
*Tuesday, February 3, 2015 at 8:03pm*

**math**

show three ways to estimate 3/5 x 9 1/2.identify each method you use.
*Tuesday, February 3, 2015 at 8:03pm*

**Math**

When Juan divides each of five consecutive integers by his age , the sum of five remainders he gets is 32 . When Nikita ,several years older , divides each of a different set of five consecutive integers by her age , the sum of the five remainders she gets is also 32 . What is...
*Tuesday, February 3, 2015 at 7:56pm*

**Math**

The velocity V ms^-1, of a moving body at time t seconds is given V = 5t^2 – 12t + 7 Calculate the acceleration when t = 2 seconds
*Tuesday, February 3, 2015 at 7:55pm*

**Math**

Name the solid according to its description: The figure has two bases that are parallel congruent circle. A. Cylinder B. Rectangular prism C. Sphere D. Cone Is the answer A? Thank you
*Tuesday, February 3, 2015 at 7:55pm*

**math**

Given that OA = 3i – 2j + k and OB = 4i – j – 3k. Find the distance between points A and B to 2 decimal places.
*Tuesday, February 3, 2015 at 7:54pm*

**math**

If A Bicycle Wheel Has A Diameter Of 27 Inches, Find The Radian Measure Of The Angle Through Which The Wheel Turns As The Bicycle Travels A Distance Of 1 Mile
*Tuesday, February 3, 2015 at 7:40pm*

**math**

a bean plant grows 15% of its height each day, after 10 days the bean plant is 27 inches tall. how tall was it yesterday?
*Tuesday, February 3, 2015 at 7:26pm*

**Math**

Polar ice is about 3/4 of the 3% of Earth's fresh water. What fraction of all of Earth's water is polar ice?
*Tuesday, February 3, 2015 at 7:13pm*

**math**

Draw a cookie that is divided into 2 equal parts.Write the fraction to go with your drawing.
*Tuesday, February 3, 2015 at 7:05pm*

**Math**

How do you change 97% into a fraction?
*Tuesday, February 3, 2015 at 7:02pm*

**Math**

A classroom of n = 10 children has a mean score of 17.200 on a measure of hyperactivity. One new child is added to the class, and the mean hyperactivity score for the resulting classroom including all the children is 18.000. Find the value of the new child's hyperactivity ...
*Tuesday, February 3, 2015 at 7:00pm*

**Math**

A 30-second commercial during this year’s Super Bowl costs $4.5 million. B) Doritos is running 2 thirty-second commercials. A 16-ounce party-size bag of Doritos costs $3.98. If after paying the production costs of making and packaging this snack the company earns $1.80 ...
*Tuesday, February 3, 2015 at 6:51pm*

**Math**

1.A tour boat on a river traveled 40 miles downstream in 4 hours. The return trip against the current took 5 hours. What was the rate of the current? A. 2.0 MPH B. 1.5 MPH C. 0.5 MPH D. 1.0 MPH This is also another question I did not understand. Thank you.
*Tuesday, February 3, 2015 at 6:40pm*

**Math**

1. The set of ordered pairs of the form (x,y) shown below represents points on a graph for a direct variation. (−4,6) (−1,−1.5) (0,0) (2,3) (6,9) Which equation best represents the relationship? A. y=3/2x B. y=2/3x C. y=x-2 D. y=x+3 Should I just plug in X ...
*Tuesday, February 3, 2015 at 6:38pm*

**Math**

Hello again! You might see me a lot today. Just a heads up. 1. Which function represents an initial population that increases 22% per year where A represents the initial value and X represents time in years? A. Y=A(0.22)^x B. Y=A(0.68)^x C. Y=A(1.22)^x D. Y=A(1.68)^x This is ...
*Tuesday, February 3, 2015 at 6:28pm*

**Math**

In a group of 9 coins, one is fake and weighs slightly less. What is the fewest number of times you need to use a pan balance to find the counterfeit coins? (A pan balance is a scale used to measure weights, where weights are placed in two pans. The heaviest pan will go down ...
*Tuesday, February 3, 2015 at 6:19pm*

**Check Answers (Math)**

1. Which binomial is a factor of x^3-3x^2-28x? A. x-4 B.x^2-4 C.x-7*** x^2-7 2. A company's profit is described by the equation. P(x)=-5^2+300x+15,000. Where x is the price in dollars that the company charges for its product. What should the company charge for the product ...
*Tuesday, February 3, 2015 at 6:17pm*

**Math**

7/15 - 2/5=
*Tuesday, February 3, 2015 at 6:16pm*

**Math**

I'm really confused on these two. Can someone help explain this to me? Thanks! :) 1.) What values of u are not permissible in the expression csc(u)tan(u)? 2.) What values of u are not permissible in the expression sin(u)cot(u)?
*Tuesday, February 3, 2015 at 6:14pm*

**Math**

Find the remainder when 3^997 is divided by 5. n=1 3n/5=3/5 n=2 3^2=9/25 n=3 3^3=27/5 n=4 3^4=81/5 n=5 3^5=243/5 r=3,4,2,1,3,4,2,1 n=997
*Tuesday, February 3, 2015 at 6:12pm*

**Math**

A tour boat on a river traveled 40 miles downstream in 4 hours. The return trip against the current took 5 hours. What was the rate of the current? A. 2.0 MPH B. 1.5 MPH
*Tuesday, February 3, 2015 at 6:09pm*

**math**

the willis tower is 1453 feet tall. it is 323 feet taller than the john hancock building. write and solve an equation to find the height of the john hancock building?
*Tuesday, February 3, 2015 at 6:06pm*

**math**

an average person's heart beats about 103, 680 times a day. write and solve an equation to find about how many times the average person's heart beats in a minute
*Tuesday, February 3, 2015 at 6:00pm*

**Math**

Solving systems by Multiplying. 4x-2y=7 3x+6y=9
*Tuesday, February 3, 2015 at 5:45pm*

**math**

the number of photos t.j. has on his laptop is twice as many as the amount rolando has on his laptop. write and solve a multiplication equation to find how many photos rolando has on his laptop
*Tuesday, February 3, 2015 at 5:42pm*

**Math**

your family is planning a 4-h car trip. along the way, you are planning to make a 1/2-h stops. at what time should you leave home to arrive at the destination by 8:00pm.?
*Tuesday, February 3, 2015 at 5:15pm*

**math**

where the parentheses in 4=3-1+4/2
*Tuesday, February 3, 2015 at 5:00pm*

**Math**

An item regularly priced X has a 130% mark up. Write two expressions for the new price
*Tuesday, February 3, 2015 at 4:47pm*

**math**

What is the area of the largest rectangle with lower base on the x-axis and upper vertices on the curve y = 12 - x^2?
*Tuesday, February 3, 2015 at 4:37pm*

**math**

What are the two positive integers whose sum is 200 and whose product is a maximum?
*Tuesday, February 3, 2015 at 4:36pm*

**math**

Find the absolute maximum of the function f(x)=2x+1, where -2<x<0 (-x^2)+1, where x>0
*Tuesday, February 3, 2015 at 4:35pm*

**math**

where are the parentheses in 3 times 2 minus 4 divided by 1
*Tuesday, February 3, 2015 at 4:35pm*

**Math**

Randy had a sheep that started eating more and more as each day passed. on the first day, Tandy's sheep ate 5 carrots. On the second day, Randy's sheep ate 11 carrots. On the third day, the sheep ate 18 carrots. And on the fourth day, the gluttonous sheep ate 26 ...
*Tuesday, February 3, 2015 at 4:06pm*

**Math **

How would I write an expression for the following? 20 less than a number
*Tuesday, February 3, 2015 at 4:01pm*

**Math**

Trey can drive his car 130 miles on 4 gallons of gas. At this rate, how many miles can Trey drive on 6 gallons of gas?
*Tuesday, February 3, 2015 at 3:51pm*

**math work for workeys**

Ok so I have an example and I used it for my work. First I'll show the example. Multiply a mixed number with a whole number. 4 times 2 and 1/8 . You multiply 4 times 2 and 4 times 1/8. Get 8 + 4/8. Simplified and got 8 and 1/2. The problem that I got was. You are a lead ...
*Tuesday, February 3, 2015 at 3:50pm*

**math**

The second and fifth terms of a geometric progressions are 16 and 2 respectively. Determine the common ratio and the first term
*Tuesday, February 3, 2015 at 3:34pm*

**Math Homework**

I'm really confused on how to do this. Can someone show me step by step on how to solve this? The directions say to use the Sum-to-Product formulas to find the exact value of the expression. sin 5pi/4-sin 3pi/4
*Tuesday, February 3, 2015 at 2:57pm*

**Math**

I'm really confused on these two. Can someone help explain this to me? Thanks! :) 1.) What values of u are not permissible in the expression csc(u)tan(u)? 2.) What values of u are not permissible in the expression sin(u)cot(u)?
*Tuesday, February 3, 2015 at 2:10pm*

**Math Work**

Can someone please help me with this? Thanks! :) Directions: Use the Product-to-Sun formulas to write the product as a sun or difference. 4cos pi/3 sin 5pi/6
*Tuesday, February 3, 2015 at 1:57pm*

**Math - Answer Check**

Determine whether the polygons are similar. ABCD with vertices A(–5, 4), B(–2, 4), C(–2, 2), D(–5, 2) and EFGH with vertices E(–2, 0), F(4, 0), G(4, –6), H(–2, –6) They aren't similar, right?
*Tuesday, February 3, 2015 at 12:17pm*

**math**

(1/36)^w+2 < (1/216)^4w
*Tuesday, February 3, 2015 at 11:41am*

**math**

Spencer Morris works in the telemarketing division for a company that pays a salary of $735 per month plus a commission of 31 2% of all sales greater than $15,500. If he sold $45,900 last month, what was his total gross pay?
*Tuesday, February 3, 2015 at 11:21am*

**Math**

sorry I wrote problem wrong: Which equation would you use to find out if the two lines in the graph are parallel:(a)(1,4) and (-1,1) (b) (3,3) and (-1,-1) a. 4-1/-2-1 = 3-1/3-1 b. 4-1/-2-1 = 3-(-1)/3-1 c. 4-1/1-(-2)= 3-(-1)/3-(-1) d. 1-(-2)/4-1 = 3-1/3-1
*Tuesday, February 3, 2015 at 10:25am*

**Math**

How can you determine if the given lines are perpendicular :(a)(1,4) and (-1,1) (b) (3,3) and (-1,-1) a. 4-1/-2-1 = 3-1/3-1 b. 4-1/-2-1 = 3-(-1)/3-1 c. 4-1/1-(-2)= 3-(-1)/3-(-1) d. 1-(-2)/4-1 = 3-1/3-1
*Tuesday, February 3, 2015 at 10:22am*

**Math**

Determine the equation of the lines perpendicular to the given lines and passing through the given points:(a)(1,4) and (-1,1) (b) (3,3) and (-1,-1) a. 4-1/-2-1 = 3-1/3-1 b. 4-1/-2-1 = 3-(-1)/3-1 c. 4-1/1-(-2)= 3-(-1)/3-(-1) d. 1-(-2)/4-1 = 3-1/3-1
*Tuesday, February 3, 2015 at 10:21am*

**math**

17+k=514
*Tuesday, February 3, 2015 at 10:11am*

**Math**

Directions: Find all solutions of the equation in the interval (0, 2pi) sin x/2=1-cosx
*Tuesday, February 3, 2015 at 8:09am*

**Math Help**

Hi! Can someone help check this for me and see if I'm doing it right? Thanks!! :) Directions: Use the Half-Angle formulas to determine the exact value of sin(pi/12). Here's what I have: π/12 = ( 180° ) / 12 = 15°. = sin ( π/12 ) = sin 15° = sin ( ...
*Tuesday, February 3, 2015 at 8:08am*

**math**

limit as x --> ininity of (5-e^x)/5+ 3e^x
*Tuesday, February 3, 2015 at 7:29am*

**math**

Mohan and Sohan went to a bakery shop. Mohan bought 6 puffs, four burgers and three cakes and used up all the money he had. Sohan bought three puffs, eight burgers and six cakes and spent 20% more than Mohan. What percent of his money did Mohan spend o puffs? Please e help me ...
*Tuesday, February 3, 2015 at 2:52am*

**physics/Math**

Buffy the Vampire Slayer is buffing up her 0.53 meter long arms by bench pressing. In 31 seconds she can lift 39 kilograms of mass 22 times. How powerful are Buffy's arms?
*Tuesday, February 3, 2015 at 2:07am*

**Math**

Can't get started on this for my granddaughter: Grace had 3 times as many berries as Tyler. After Grace eats 50 berries she has half as many berries as Tyler. How many berries does Grace have left.
*Tuesday, February 3, 2015 at 1:40am*

**math**

are the following a function 1. y=x/2 my guess is yes 2. y=2x+1 my guess is yes 3.y=x^2 my guess is yes 4.y=mx+b im not sure
*Tuesday, February 3, 2015 at 1:22am*

**math**

Does a machine that takes one quarter at a time into its input and produces one gumball in its output act like a function? my guess is YES
*Tuesday, February 3, 2015 at 1:14am*

**math**

Which one of the following statements is true? If f is continuous on (a, b), then f attains an absolute maximum value and f attains an absolute minimum inside the interval (a, b). If f '(x) > 0 on the interval (a, b), then f is decreasing on the interval (a,b) If f and ...
*Tuesday, February 3, 2015 at 1:04am*

**math**

Find the x-coordinate of the point(s) of inflection on the graph of y = x^3 - 12x^2 - 5.
*Tuesday, February 3, 2015 at 1:03am*

**math**

What are the critical values on the graph of y = x^3 - 6x^2 + 9x + 3?
*Tuesday, February 3, 2015 at 1:02am*

**math**

Use the circle graph shown below to answer the question 42% =football 25% =soccer 33% =baseball If 210 people said football was their favorite sport to watch how many people were surveyed?
*Tuesday, February 3, 2015 at 12:59am*

**math**

An equation is not a function if even one x value produces ____ corresponding y value(s). one less than one more than one zero for a my guess is more
*Tuesday, February 3, 2015 at 12:49am*

**Physics/Math**

A 25.0 gram piece of charcoal is found in some ruins of an ancient city. The sample shows a 14C activity, R, of 250 decays/min. How long (in years) has the tree this charcoal came from been dead? I think I have the use the equation: R=lamda*No*e^(-lamda*t) but I am not sure ...
*Tuesday, February 3, 2015 at 12:29am*

**math**

Todd needs to make 6 sandwiches. He uses an eight of a loaf of bread for each sandwich. draw a number line to represent how much bread he needs for 6 sandwiches? 0--1/6---2/6---3/6---4/6---5/6---6/6---1 Is this correct y or y-not? thank you.
*Tuesday, February 3, 2015 at 12:18am*

**Math**

Assume the shoe is sold at 50% profit margin (profit as % of sales). If the cost of raw material were to increase by 50%, what would the new profit margin be? Cost of manufacturing a shoe: Raw materials = 25% Labor = 12.5% Marketing & Advertising = 25% Distribution = 25% ...
*Monday, February 2, 2015 at 11:26pm*

**math**

if a car passes mile marker 2 in 4 hours and a mile marker 125 in 6 hours, how many miles per hour is the car traveling?
*Monday, February 2, 2015 at 11:04pm*

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