Branches of Math
Recent Math Questions
Consider the function y = 3x5 25x3 + 60x + 1. Find the critical points of this function. So I got 1 and 2 as the critical points..but I feel like I did something wrong, is this right?
Tuesday, December 9, 2014 at 8:42pm
7th grade math
Can you check these? 1. A recipe for chocolate pudding calls for 1 ¼ cups of milk. The recipe makes 3 servings. How many cups of milk are needed to make 9 servings? Ans: 1.25/3 = x/9 3x = 9*1.25 3x = 11.25 x = 11.25/3 x = 3.75 or 3 3/4 cups of milk 2. Two trees in Mrs. ...
Tuesday, December 9, 2014 at 8:33pm
Lat math question for some days. Can y'all help?
Huan deposited $850 into a college savings account earning 4.8% interest compounded annually. He also deposited $850 into a second account earning 4.8% simple interest. He made no additional deposits. After 10 years, which account earned more interest? How much more? A The ...
Tuesday, December 9, 2014 at 8:27pm
Can you help me with this math problem? ASAP plz!
Lester deposited $400 into a savings account earning 4.5% simple interest, and $450 into an investment account earning 3.2% interest compounded annually. What was the total interest he earned in 3 years? A $986.00 B $89.06 C $9.60 D $98.60
Tuesday, December 9, 2014 at 8:05pm
MATH HELP ASAP!
Randee invested $1000 for college in an account earning 5% simple interest. When she withdrew the investment, she had earned a total of $550 in interest. How long was the money invested? A 9 years B 10 years C 11 years D 12 years
Tuesday, December 9, 2014 at 7:53pm
Ok so my problem is -3(3x+15)-(10+x)=35 After doing most of the problem I ended up getting -10x=105. I need to have a whole number as an answer but I can't understand what to do.
Tuesday, December 9, 2014 at 7:50pm
The price of a gallon of gasoline increased by 5 cents one week, decreased by 3 cents each of the next two weeks, and increased by 9 cents the fourth week. Find the average change in the price of gasolina for the 4 weeks.
Tuesday, December 9, 2014 at 6:33pm
Manny makes dinner using 1 box of pasta and 1 jar of sauce. If pasta is sold in pckages of 6 boxes and sauce is sold in packages of 3 jars, what is the least number of dinners that Manny can make without any supplies left over?
Tuesday, December 9, 2014 at 6:24pm
The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 165 and a variance of 9. The material is considered defective if the breaking strength is less than 157.8 pounds. What is the probability that a single, randomly selected piece...
Tuesday, December 9, 2014 at 6:20pm
If a large factory sells its new gadgets for $5 each it can sell 1050 per month and if it sells the same gadgets for $9 it will sell 900 per month. Assuming the relationship between price and sales is linear predict the monthly sales of gadgets to the nearest whole number if ...
Tuesday, December 9, 2014 at 6:06pm
alan, gil, and deb's point in a video game was in the ratio 2:3:4.deb scored 114400 points. how many points did gill score? how many points did they score in all PLEASE HELP but can you make your answer so that I can understand I am in 6th grade but I am not the that smart...
Tuesday, December 9, 2014 at 6:03pm
In 1980 the average price of a home in Brainerd County was $97,000. By 1986 the average price of a home was $109,000 Write a linear model for the price of a home, P, in Brainerd County as a function of the year, t. Let t=0 correspond to 1980
Tuesday, December 9, 2014 at 5:56pm
Consider the project with the following expected cash flows: Year Cash flow 0 -$400,000 1 $100,000 2 $120,000 3 $850,000 If the discount rate is 0%, what is the project's net present value? If the discount rate is 2%, what is the project's net present value...
Tuesday, December 9, 2014 at 5:27pm
Compute Brianna's estimated tax payment for the third quarter. She is self-employed and she expects to earn $84,400 this year. Her estimated income tax rate is 22%. For self-employed persons, social security tax is 12.4% of wages up to $106,800, and Medicare tax is 2.9% of...
Tuesday, December 9, 2014 at 5:24pm
Writers often make common errors by omitting punctuation. Identify and explain the sentence structure error in the following sentence: Tabitha drove to school she took her math test she drove home in the afternoon.
Tuesday, December 9, 2014 at 5:12pm
MATH HELP! Complex Interest
Huan deposited $850 into a collegesavings account earning 4.8% interestcompounded annually. He also deposited$850 into a second account earning 4.8%simple interest. He made no additionaldeposits. After 10 years, which account earnedmore interest? How much more? A The account ...
Tuesday, December 9, 2014 at 4:13pm
Emily spent 1/2 of her money at the store. Then she spent 1/2 of what was left at the bakery. next she spent 1/2 of what was left at the music store. She spent the remaining$6.00 at school. How much money did Emily start with?
Tuesday, December 9, 2014 at 3:58pm
Ms. Johnson's class is having a pizza party. If there are 14 students and 7 pizzas cut into 8 slices, what answer choice represents the fraction of one pizza that each student receives? A.) 1/3 B.) 1/4 C.) 1/2 D.) 1/8
Tuesday, December 9, 2014 at 3:52pm
Trina has 90 tootsie rolls and 45 blow pops that she is making into goodie bags. Each bag will have the same number of tootsie rolls and blow pops. What is the greatest number of goodie bags Trina can make with no candy left over? How many tootsie rolls and how many blow pops ...
Tuesday, December 9, 2014 at 3:51pm
Amy has 17 employees on her staff. She gave 3 chocolate chip cookies and 2 peanut butter cookies to each employee. What is the total number of cookies she gave away?
Tuesday, December 9, 2014 at 3:29pm
Sally wants to put lights all around her windows. She has 15 windows all the same. Each one is 3 feet long and 2 feet wide. How many strands of lights will she need to buy if each strand covers 10 feet? How much will it cost her if each strand of lights costs $6.99? Don't ...
Tuesday, December 9, 2014 at 3:24pm
Express the product, x^2 + 4x divided by 2x^2+13x+15 multiplied by x+5 divided by x^2 - 16 ? a)-1/2x+3 b)x/(2x-16)(x+4) c)(x^2+4x)(x+5) / (2x^2+13x+15)(x^2-16) d)x / (2x+3)(x-4)
Tuesday, December 9, 2014 at 12:34pm
Jack says that once you have a common denominator you are ready to subtract two mixed numbers. What other step might be necessary before you can subtract? Give an example.
Tuesday, December 9, 2014 at 12:21pm
Calculate the markdown percent. Round to the nearest tenth and do not enter the percent symbol in your answer. % b. If the offer was changed to "Buy 3, Get 2 Free," what would be the new markdown percent? Round to the nearest tenth and do not enter the percent ...
Tuesday, December 9, 2014 at 10:00am
The math grades on the final exam varied greatly. Using the scores below, how many scores were within one standard deviation of the mean? How many scores were within two standard deviations of the mean? 99 34 86 57 73 85 91 93 46 96 88 79 68 85 89
Tuesday, December 9, 2014 at 1:07am
Math (Word Problem into formula)
A chemist is studying the properties of a bronze alloy (mixture) of copper and tin. She begins with 6 kg of an alloy that is one sixth tin. Keeping the amount of copper constant, she adds small amounts of tin to the alloy. Letting x be the total amount of tin added, define c(x...
Monday, December 8, 2014 at 11:53pm
An experiment consists of drawing one ball from a box containing 5 white balls numbered 1 through 5 and black balls numbered 6 through 10. Find the probability that a randomly selected ball is black and numbered 7.
Monday, December 8, 2014 at 10:40pm
(6/x^2+5x+6) + (9/x+3) express answer in reduced form What i attempted is to factor out the bottom half of the first fraction to 6/(x+2)(x+3) the second half i'm guessing would be to multiply each side by the x+3? making it a (6x+18/(x+2)(x+3)) + 9 or would i write it as 6...
Monday, December 8, 2014 at 9:53pm
A scale drawing of your classroom is 4 inches by 6 inches. If one inch represents 8 feet, what is the actual size of your classroom? I think I know the answer, jst having trouble figuring out how to write it down & show it. I think it's 32 feet by 48 feet. Help! Thanks
Monday, December 8, 2014 at 8:29pm
On an airplane, there are two seats on the left side in each row and three seats on the right side. There are 90 seats on the right side of the plane. How many seats are on the left side of the plane? How many seats are there altogether?
Monday, December 8, 2014 at 7:54pm
1. 77 is what percent of 192? A. x/100=77/192;4.01%**** B. x/100=77/192;40.1% C. x/77=100/192;77.3% D. x/100=192/77;249.4% 2.Of the 80 eigth-graders, 32 are going on the class retreat. What percnt of the eigth grade going on the retreat? A. 25% B. 55% C. 40% D. 32%*** 3. ...
Monday, December 8, 2014 at 7:48pm
Carrie and Krystal are taking a road trip from Greenville and North Valley . On Carries's map, Greenville and North Valley are 4.5 inches apart. The scale is 1 inch=20 miles. How far is Greenville from North Valley? The scale on Kystal's map is 1=18 miles. How far ...
Monday, December 8, 2014 at 7:47pm
Tom buys a shirt for $22.00 plus 7% sales tax. His cousin buys a shirt for $18.00 plus 4% sales tax. a. How much do Tom and his cousin pay for the shirts? Show your work b. Who spent more on tax My answers $22.00*7%=1.54 $22.00+1.54=$23.54 $18.00*4%=0.72 $18.00+0.72=$18.72 Tom...
Monday, December 8, 2014 at 7:37pm
Forks:Spoons There are 7 forks and 5 spoons. What's the ratio? Explain what the ratio means. I know what the ratio is its 7:5 right? I just need help on the second one. How do I explain it?
Monday, December 8, 2014 at 7:11pm
what x 12 is close to 57 12 divided by 5.79 = That is what I am trying to figure out so i skipped 5 and move on to 57 in the problem and i need to know what x 12 = close to 57
Monday, December 8, 2014 at 6:59pm
5th grade math
Q. The Johnson family has been very busy and has not done there laundry for several weeks. The dirty laundry pile consists 540 items of clothing. They figure they can put average of 27 pieces of clothing in a single load. How many loads if laundry will the Johnson family have ...
Monday, December 8, 2014 at 6:57pm
Let S be the part of the sphere x^2 + y^2 + z^2 = 25 that lies above the plane z = 4. Let S have constant density k. (a) Find the center of mass. (b) Find the moment of inertia about the z-axis. so far I have found that the magnitude of r(theta)x r(thi)= 25sin(thi)but I cant ...
Monday, December 8, 2014 at 6:50pm
Let S be the part of the sphere x^2 + y^2 + z^2 = 25 that lies above the plane z = 4. Let S have constant density k. (a) Find the center of mass. (b) Find the moment of inertia about the z-axis.
Monday, December 8, 2014 at 6:45pm
The population of town A increases from 1,346 to 1,500. In the same period, the population of town B increases from 1,546 to 1,800. a. Find the percent of increase in population for town A and for town B. b. Which town had the greater percent of increase? My answer town A. 1,...
Monday, December 8, 2014 at 6:28pm
1.Of the 80 eith-graders, 32 are going on the class retreat. What percent of the eith grade going on the retreat? A. 25% B. 55%*** C. 40% D. 32% 2.What is the sale price for a pair of shows that was originally prices at $54.99 and now is 20% off? A. $38.49 B. $41.24 C. $43.99...
Monday, December 8, 2014 at 6:00pm
1.The Census Bureau estimates that in 2025, 20 of 50 states will have a Spanish-speaking majority. What percent of the states will have a Spanish-speaking majority? A. 20% B. 30% C. 40%*** D. 50% 2. What percent of 25 is 10? A. 10=p*25;40% B. 10=p*25;250% C. 25=p*10;40% D. 25=...
Monday, December 8, 2014 at 5:47pm
1.Liam wants to buy a bicycle that costs $290.00. His parents say Liam must raise 40% of the money himself. How much money must Liam raise? A. $112.00 B. $40.00 C. $116.00*** D. $87.00 2.Solve the proportion using cross products 29 miles/58 hours=10 miles/ h hours A. 10 B. 20...
Monday, December 8, 2014 at 5:31pm
1.Write the fraction 8/9 as a percent. Round to the nearest hundereth of a percent where necessary. A. 88.89%*** B. 1.13% C. 44.44% D. 66.67% 2.Write the decimal 0.237 as a percent. A. 0.237% B. 2.37% C. 23.7%*** D. 237% 3.Jerry sold 7/20 of the total number of tickets that ...
Monday, December 8, 2014 at 5:17pm
A punch recipe says to mix 4 cups of pineapple juice, 8 cups of orange juice, and 12 cups seltzer in order to make 18 servings of punch. How many cups of each ingredient do you need to make 108 cups of punch? ----- cups of pineapple juice ----- cups orange juice - ----- cups ...
Monday, December 8, 2014 at 4:49pm