Wednesday
October 26, 2016

# Homework Help: Math

## Recent Math Questions

math
3n + 16 = 7n n=?
Friday, September 23, 2016 by Haruhi Fujioka

math
2k+9=7−3k k=?
Friday, September 23, 2016 by Haruhi Fujioka

math
−2(x+2/3)+1=5 x=?
Friday, September 23, 2016 by Haruhi Fujioka

math
The spinner below is used in a game, if you spin the spinner once what is the probability that it will land on a multiple of 3 or an even number
Friday, September 23, 2016 by AnonymousAnonymous

math
0.61m-1.51m=9 m=?
Friday, September 23, 2016 by Haruhi Fujioka

Engineering Math
I don't know where to start on this one. A thermometer is taken from an inside room to the outside, where the air temperature is ten degrees Fahrenheit. After one minute the thermometer reads 40 degrees Fahrenheit, and after two minutes it reads twenty-five degrees ...
Friday, September 23, 2016 by Erica

insert in parentheses: 14+2=6+2x3+2
Friday, September 23, 2016 by john

math
n-2=10n+4 over 2 what is the value of n?
Friday, September 23, 2016 by Mei misaki

math
a respie requires 2 cups of flour to make 10 servings and 8 cups of flour to make 40 servings. How many cups of flour are needed to make 30 servings
Friday, September 23, 2016 by grace

Engineering Math, Newtons Cooling Method
Newton's equation for a free falling object with air resistance of mass m kilograms says that its velocity v(t) satisfies the DE mv'(t) = mg - kv(t) where g = 9.8 \frac{m}{s^2} and v(t) is measured in \frac{m}{s}. Suppose that k=2 \frac{kg}{sec} and that a ball of mass...
Friday, September 23, 2016 by Erica

Engineering Math
An unknown radioactive element decays into non-radioactive substances. In 120 days the radioactivity of a sample decreases by 59 percent. What is the half life of the element? How long will it take for a sample of 100 mg to decay to 77 mg? The answer is not 93 day, I ...
Friday, September 23, 2016 by Erica

Math
Is |-13| and -13 the same or different?
Friday, September 23, 2016 by Mathhhhh

Math
find three consecutive positive integers such that 4 times the first 13 more than the third.
Friday, September 23, 2016 by Kevin paniagua

Math
Math question: My plane arrived in Chicago 45 minutes later from Detroit. How fast was my plane which traveled at about 20000 altitude?
Friday, September 23, 2016 by Lisa

Math
Determine whether the given numbers are solutions of the inequality. 6, -19, -18, -3 y-9>2y-2
Friday, September 23, 2016 by Nikki

math
You purchased a suit on sale for $220 that was originally priced for$275. what was the percent of discount?
Friday, September 23, 2016 by Anonymous

math
Greg rubs the balloon on his wool sweater, and the charges on the balloon separate so that there are negative areas and positive areas. Which of these statements correctly describes what happens as a result?
Friday, September 23, 2016 by Olivia (but call me Oli)

Math
Suppose f(t) = P0e^-0.3t grams of radioactive substance are present after t seconds. If 200 grams of substance are present initially, how much is present after 4 seconds? What is the half-life of the substance?
Friday, September 23, 2016 by Freud Mark

Math
5/16+7/16
Friday, September 23, 2016 by Eureka

Math
Ashleigh moed 50 lawns last Month. Keshia mored 40 less than twice than ashleigh. How many laws did Keisha moe
Friday, September 23, 2016 by Anonymous

math
Jannah spent 2/3 hour doing her homework. How much minutes did she spent doing her homework?
Friday, September 23, 2016 by lyza

math
(i)prove that 1/1+sintheta +1/1-sin theta=2sec^2 theta
Friday, September 23, 2016 by Mayank

Math
How to compare 0.7 and 5/8
Friday, September 23, 2016 by Shawn

math
the numerator of a fraction is 3 less than the denominator. if 4 us added to the numerator and to the denominator, the resulting fraction is equivalent to 3/4. find the original fraction. Show your solution
Friday, September 23, 2016 by mm

math
the numerator of a fraction is 3 less than the denominator. if 4 us added to the numerator and to the denominator, the resulting fraction is equivalent to 3/4. find the original fraction
Friday, September 23, 2016 by mm

Math
If the revenues fron the extra 1/4% sales tax amounted to $48,136.47 in 1983 and is to be divided equally among 7 different departments within the city of Albuquerque, how much will each department receive ? Thursday, September 22, 2016 by Amy Math If you purchase a tv and pay$40 down and $32.60 a month for 8 months, and what was the purchase price of the tv? Thursday, September 22, 2016 by Amy Math Maggie has a ribbon 27 feet long what is the length of the ribbon in yards Thursday, September 22, 2016 by Sincere Math Kelso created the scale drawing below what is the scale factor of his drawing 1 inch equals 8 feet the rectangle is 4 feet by 12 feet Thursday, September 22, 2016 by ezzy Math How many choices do I have if I use three colors from red, white, yellow and blue Thursday, September 22, 2016 by Kim Math A total of 120 students attend top view high school.the ratio of teachers to students is 1:30. Whats the answer Thursday, September 22, 2016 by Karen Math How to do the coffee shop has nine pies Thursday, September 22, 2016 by Mara Math How do you solve it in pictures Thursday, September 22, 2016 by Mara Math What is this from least to greatest -8.2,0.4,-2 1/2,2.4 I got 0.4,-2 1/2,2.4.-8.2 Thursday, September 22, 2016 by Jenny Math 120 students attend top view high school.the ratio of teacher to students is 1:30. Thursday, September 22, 2016 by Karen Math (Plz Help ASAP) A navy submarine descended from sea leval at a rate of 7 feet per second. a. Write the decent rate as an integer b. Find the submarine's elevation after 10 min. I need help ASAP!! Thursday, September 22, 2016 by Verna math One car is traveling at a speed of 242km/h and another one at a speed of 217km/h.In 12 hours,how much farther will the car that's traveling at 242km/h go than the car that's traveling at 217km/h? Thursday, September 22, 2016 by Carlos Math Write and solve a real- world problem that can be solved using the expression 3/4 divided by 1/6? Thursday, September 22, 2016 by Fred Math Write and solve a real- world problem that can be solved using the expression 3/4 divided by 1/6? Thursday, September 22, 2016 by Mitch N Math In the jazz band at Wyatt's school, there are 15 trumpets and 9 trombones. Find the ratio of trombones to trumpets? Thursday, September 22, 2016 by Ann Math Solve each equation if the domain is: (-3,-1,2,5,8) 3x-1/2y=6 Thursday, September 22, 2016 by Anonymous math algebra Evaluate the following algebraic expressions for the given value: 1. 4y-115 if y=7 2. 312 + 78x if x=4 3. 8z2 - 9 if z=3 Thursday, September 22, 2016 by louie Math (6.0x10^5)x(3.0x10^4)=? 18x10^20 18x10^9 1.8x10^20 1.8x10^10 2.(5x10^-2)/(2x10^10=? 2.5x10^-5 2.5x10^-1 25x10^1 25x10^2 3.(2.56x10^6)x(3.56x10^2)=? 9.1136x10^12 91.136x10^8 9.1136x10^8 91.136x10^12 4.In a recent year, the population of California was about 2.52x10^7 people. ... Thursday, September 22, 2016 by Missy Math Integrate : ∫(2x^2 ln⁡8)dx Thursday, September 22, 2016 by Wawen Math In my number, the digit in the tens place is half the digit in the ones place. The sum of the digits is 9 Thursday, September 22, 2016 by Louise Math I invested a certain amount of money at 4% and an amount$2000 less than the first amount at 5%. If the income from the 5% investment is 3/4 of the income from the other, find the amount of money that I invested at 4%.
Thursday, September 22, 2016 by Jazzy

MATH
1.What is the probuct of (5.1 x 10^3) x (3.2 x 10^3)? A. 16.32 x 10^6 B. 1.632 x 10^7 C. 16.32 x 10^9 D. 1.632 x 10^10 2.What is the product of (7.28 x 10^-2) x (9.1 x 10^-2)? A. 6.66248 x 10^-3 B. 66.248 x 10^-4 C. 6.6248 x 10^4 D. 66. 248 x 10^-3 3.What is the quotient of (2...
Thursday, September 22, 2016 by Anuenue

Math
If two fair dice are​ rolled, find the probability that the sum of the dice is 6​, given that the sum is greater than 3.
Thursday, September 22, 2016 by Joshua

MATH
1.Which of the following is greater than 4.3 x 10^9. A. 2.1 x 10^9 B. 3.2 x 10^9 C. 5.3 x 10^9 D. 7.4 x 10^8 2.Which of the following is less than 6.5 x 10^-5. A. 1.4 x 10^-3 B. 2.5 x 10^-4 C. 7.8 x 10^-5 D. 4.6 x 10^-6 3.According to this 2010 census, the population of ...
Thursday, September 22, 2016 by Anuenue

Math
Use the clue bellow to find the mystery number: - The mystery number has 3 digits - The sum of the digits in the mystery number equals 16 - The mystery number is greater than 800 and less than 825 - All digits in the mistery number are even.
Thursday, September 22, 2016 by Henry

Math
What is mental math in times 3 digits like 8times25times23?
Thursday, September 22, 2016 by Tisari

Math
I need help with decimal Bedmas, I find that when I use a calculator and split up the equation into the proper sections the awnser sometimes out wrong. I don't know what im doing wrong. eg. 2.3 (4.5-9.6)+3.1= (4.5-9.6)= -5.1. 2.3x-5.1=-11.73+3.1=-8.63.
Thursday, September 22, 2016 by J. A.

Math
A jet can travel 460 miles per hour, how far can it travel between 8:00 am 10:00 am?
Thursday, September 22, 2016 by CANT TELL YA

math
each student needs 2/5 of a cup of play dough to build a house. How many cups of play dough are needed for 9 students?
Thursday, September 22, 2016 by Michael

Math
Dori claims that 3.52 is not a rational number because it is not written as a ratio of integers. Is she correct? Explain why or why not.
Thursday, September 22, 2016 by Sydney

Math
The bearing of P from Q is 140degree and that of X from P is 315degree. If |PQ|=36km, and |PX|=55km, find |QX| and the bearing of Q from X.
Thursday, September 22, 2016 by Anonymous

Math
Start at 5. Create a pattern that adds 3 to each number. Stop when you have 5 numbers.
Thursday, September 22, 2016 by Don

Math
Let A = {x: x 3x=6}. Does A? My answer: A ≠ 2 because x = 2 and x is an element of set A. Thus, A = {2}, but A itself is not equal to 2.
Thursday, September 22, 2016 by NR

math
[(8^2- 4) - 6]/6= Please teach me show steps
Thursday, September 22, 2016 by help

math
Pencils sell for 18 cents each, and pens sell for 69 cents each. How much would 14 pencils and 11 pens cost?
Thursday, September 22, 2016 by Diontay

math
The information below represents the cost of Michelle's car ownership for last year. What is her average monthly expenditure related to her car? ● Auto loan of $498.89 per month ● Auto insurance of$68.12 per month ● Gasoline expenditure of $1,740.00 for ... Thursday, September 22, 2016 by Scribble math Each test grade in Sara's science class counts for 1/6 of the final grade. The final exam counts for 1/2. Sara's test scores are 72, 84, and 90. Her final exam score is 90. What is Sara's final grade for the class? A) 83 B) 86 C) 87 D) 89 Thursday, September 22, 2016 by Scribble math a car traveling 64 miles per hour passes a bus traveling 53 mph in the same direction on the highway, if they maintain their speeds, how long will it take them to be 17.5 miles apart Thursday, September 22, 2016 by jason math x^3-(p+q-r)x^2+(pq-pr-qr)x+pqr How to factor this?? Thursday, September 22, 2016 by anon Math My car gets 24 miles per gallon I put 15.1 gallons of gas in my tank how many miles can I drive on 15.1 gallons of gas? Thursday, September 22, 2016 by Julie math you buy refrigerator for 12,800 and make a down payment of 2,500. if ypu finance the remainder at 8% annually for 3 years, how much will you actually pay for the refrigerator? Thursday, September 22, 2016 by Arvee math Prove the identity tanA/secA+1 + cotA/cosecA+1=cosecA+secA -secAtanA Thursday, September 22, 2016 by vsjavsj Math Ron johns 16 card to my deck of 52 cards the deck is made up of card to four different colors red blue yellow and green how many of the cards drawn can Ron expect to be green? Thursday, September 22, 2016 by Hazel math 101 a student has ten posters to pin up on the wall of her room, but there is space for only seven. in how many ways can she choose the posters to be pinned on the wall? Thursday, September 22, 2016 by arvee MATH HELP What is the simplified form of the expression? Hint: Combine like terms 7m2 + 6.5n – 4n +2.5m2 – n A)9.5m2 + 1.5n B)4.5m2 + 1.5n C) 9.5m2 – 1.5n Which property is illustrated by the statement? 8 + 3.4 = 3.4 + 8 A)Associative Property of Addition B) Commutative ... Thursday, September 22, 2016 by ASTROLATER Math In an examination of 100 marks a person attempted 77 questions and got 42 correct answer and 35 wrong answer. If each correct answer carried 2 marks and wrong answer carried 0.50 marks. How much total marks the person scored? Thursday, September 22, 2016 by Praveen Math Emma estimated the first digit in the quotient of 2,183 ÷ 42 as 4. She adjusted the quotient. What did zhe do wrong? Explain Thursday, September 22, 2016 by Mary math The unit digit of a 2-digit number is greater than the tens digit by 3. If the product of the digit is 18 find the number Thursday, September 22, 2016 by 123 Math Roy takes 1 hour 54 sec for doing his homework everyday.how much time does he spend doing his homework in a week? Thursday, September 22, 2016 by Soumoli Math the sum of the digits of a 2 -digits number is 9.The new number obtained by interchanging the digits exceeds the given number by 27. find the given number Thursday, September 22, 2016 by Bablu Math The sides of a triangle is 6,8,15 cm long. in a similar triangle, the longest side is 21 cm long find the two sides. Thursday, September 22, 2016 by Jason math two airplane fly toward each other from points 900 miles apart, at the rate, per hour, of 300 miles and 250 miles. when will they meet if they start at the same instant? Thursday, September 22, 2016 by chelsy math algebra two airplane fly toward each other from points 900 miles apart, at the rate, per hour, of 300 miles and 250 miles. when will they meet if they start at the same instant? Thursday, September 22, 2016 by chelsy math algebra at how many minutes after 3pm will the minute hand of a clock overtake the hour hand? Thursday, September 22, 2016 by chelsy math algebra a motorboat, which can travel at 20 miles per hour in still water, takes 3/5 as long to travel downstream on a river from a to b, as to return. Find the rate of the rivers current. Thursday, September 22, 2016 by chelsy math a man accepts a position at 14,250 basic salary with agreement that he will receive a 2% increase every year for 3 years. what will his salary be at the end of 3 years Thursday, September 22, 2016 by arvee Math The volume of a certain quantity of gas is inversely proportional to its pressure. If its pressure is 1000 grams per square cm, when its volume is 3m³, what will the pressure be when the gas is compressed to a volume of 2m³? (Thanks in advance in helping me here) Thursday, September 22, 2016 by Jason Math Vic and Ben's ages are in the ratio of 3:4. If Vic is 12 years old and 3 months old how old is Ben in years and months?? *Thanks in Advance for Helping me answer this question* Thursday, September 22, 2016 by Mika Math Two brothers are respectively 5 and 8 years old. In how many years will the ratio of their ages be 4:5 Thursday, September 22, 2016 by Mika Math Find the greater of two numbers in the ratio 7:9 whose difference is 10 Thursday, September 22, 2016 by LAncelot Math Reason does (4+5)+2=9+2? Explain Thursday, September 22, 2016 by Liezel Math Reason does (4+5)+2=9+2?explain Thursday, September 22, 2016 by Hazel math the sum of one and the product of one and number x how would you wite this Thursday, September 22, 2016 by Aubrey T. math Write the quadratic equation whose roots are −4 and 6, and whose leading coefficient is 5. Wednesday, September 21, 2016 by . Math The table shows information about the number of sweatshirts sold and the money collected at a fundraiser for school athletic programs. Sweatshirts Sold 3 5 8 __ 12 Money Collected 60 _ _ 180 _ The above is supposed to be a ratio table but I am not sure on how to find out the ... Wednesday, September 21, 2016 by Matt-Please Help Math There are four seats in a row of a bus except the last row which has 5 seats. The total number of seatsican be written as 5 + r x 4. Determine the number of seats in a bus for each value of r. Wednesday, September 21, 2016 by Anonymous Math algebra (a+b)(a-b) Wednesday, September 21, 2016 by Sunil MATH HELP 1)What is the simplified form of the following expression? 2x^2y+3x^2+4y+3x^2y+2y A)5x^4y^2+3x^2y+2y B)8x^2y+6y^2 C)5x^2y+3x^2=6y D)14x^2y 2)Simplify the following expression 1/3 (21m+27) A)7m+27 B)7m+9 C)63m+9 D)7m+81 3) What is the sum 7/4+(-1/5) A)31/20 B)39/20 C)6/9 D)-7/... Wednesday, September 21, 2016 by ASTROLATER Math There are two rectangles that are similar. One rectangle has an area of 24 and the other has an area of 15 how do you find the ratio of the area of the first rectangle to the area of the second rectangle? Wednesday, September 21, 2016 by Jordan Math (Geometry) What is the converse of this statement: if two angles are supplementary and congruent, then they are right angles. Wednesday, September 21, 2016 by Zoey math the sum of the ages of kristen and ben is 32 four years ago kristen was twice as old as ben how old are they both now Wednesday, September 21, 2016 by Anonymous Math 4) The sum of an infinite geometric series is 100. The second term of the series is 24. Find two possibilities for a (the first term) and r (the common ratio). b. Given, 5 2 4 a a a    159 and 4 1 3 a a a    265 , find ... Wednesday, September 21, 2016 by Susan Math The measure of angle BCA is: A) 30 degrees B) 36 degrees C) 45 degrees D) 60 degrees It is a iscoles triangle which the number 3x on the top of the triangle angle A and a line extending to D going right from A and Angle B is at the bottom left corner A and angle C is at the ... Wednesday, September 21, 2016 by Lia Math All students in Peter's class have$1.05, consisting of nickels and/or dimes and/or quarters. Each student has a different combination of coins, and all possible combinations of coins are included. What is the probability that Peter is unable to give his friend Jenny ...
Wednesday, September 21, 2016 by Thomas

Math
From a point P on the ground which is 100m from the foot of a church tower, the angle if elevation of the top of the tower is 50 degrees calculate the height of the tower...
Wednesday, September 21, 2016 by Phil