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definition of a physical change

1 year ago

examples of chemical changes

1 year ago

10, left parenthesis, 7, p, plus, 6, right parenthesis, minus, 5, left parenthesis, 5, p, plus, 4, right parenthesis10(7p+6)−5(5p+4)

1 year ago

minus, 4, left parenthesis, 8, f, plus, g, right parenthesis, plus, 9, g, minus, 5, left parenthesis, minus, 2, g, plus, 6, f, right parenthesis−4(8f+g)+9g−5(−2g+6f)

1 year ago

−17= 3 2 ​ r

1 year ago

x - 30 = 65

1 year ago

Three times William's age, w, is less than his cousin Sandra's age, 15. what are three possible ages of william

1 year ago

8(x - 20) = 304

1 year ago

"Twenty-eight is more than four times another number" can be shown by the inequality 28 > 4n. what are all possible values of n?

1 year ago

Hot packs can be used to comfort sore muscles and similar conditions. A hot pack is activated by breaking a barrier on the inside of the pack, allowing the chemicals inside to mix. The process that occurs is exothermic, meaning it releases heat and causes...

11 months ago

9 Consider the chemical reaction represented below. CH4 + 2O2 CO2 + 2H2O + Heat Which of the following statements about this reaction is true? A. Heat is absorbed by the reaction. B. The reaction releases oxygen. C. The reaction consumes water. D. The rea...

11 months ago

Rodrigo is using the design process to make a device that will cool a drink without ice or electricity. His first prototype was simply an airtight, watertight pouch containing 40 g of ammonium chloride (NH4Cl). He added 100 mL of water to the ammonium chl...

11 months ago

3= 2 3 ​ (7x−4)

11 months ago

3 x−7 ​ =6

11 months ago

You are driving to visit a friend in another state who lives 700 miles away. You are driving 65 miles per hour and have already driven 375 miles. Write and solve an equation to find how much longer in hours you must drive to reach your destination.

11 months ago

Write an equation and solve. A group of friends paid $7 each to play a round of golf. It also cost $12 to rent a golf cat. As a group, they paid $33 altogether. How many friends went to play golf?

11 months ago

Write an equation and solve. You buy five books that are equal in price for $17.50 and a DVD for $8. Your total comes to $25.50. What is the cost per book?

11 months ago

Write an equation and solve. Travis buys a new deep freezer. The manual tells him the temperature will drop 12 degrees every hour after he plugs it in. It is currently 70 degrees in his house. He checks several hours later and the freezer reads -2 degrees...

11 months ago

Lin got a $80 gift card to an online music store. She uses the gift card to buy an album for $9.99. She also wants to use the gift card to buy some songs. Each song costs $1.29. write an inequality for this

11 months ago

Find a ratio equivalent to whose second quantity is 1.

11 months ago

rewrite 4/10 : 1/25 as a unit rate

11 months ago

8(5x + 1) + 3(9 - x)

11 months ago

8g - g = 7g

11 months ago

(7x + 8) + (15 - 7x)

11 months ago

$6.50(c + 18) = $6.50c + $117.00

11 months ago

(13x + 9y) + (38x + 33y)

11 months ago

There are 180 students in the seventh grade, and 20% are in the Environmental Club. How many students are in the Environmental Club?

11 months ago

540 is what percent of 750?

11 months ago

What is 61% of 300?

11 months ago

What is 28% of 575?

11 months ago

455 is what percent of 700?

11 months ago

Britney is buying a shirt and a hat at the mall. The shirt costs $30.79, and the hat costs $19.75. If Britney gives the sales clerk $100.00, how much change should she receive? (Ignore sales tax.) A. $46.36 B. $49.46 C. $50.54 D. $59.21

11 months ago

Avery had $25.57 in her wallet. If she bought lunch with 8 3/4 dollars from her wallet, how much money did she have in her wallet after lunch? A. $17.57 B. $15.82 C. $17.27 D. $16.82

11 months ago

The planner for a company celebration bought 272 balloons. While he was inflating them, 12 of them overinflated and burst. If he had to place them evenly into 5 rooms, how many balloons were in each room? A. 52 B. 47 C. 57 D. 54

11 months ago

Rita earns $15.00 per hour. If she gets a 5% raise, what will be her new hourly wage? A. $14.25 B. $20.00 C. $15.75 D. $15.05

11 months ago

Colby is making a home video consisting of a 5-minute introduction followed by several short skits. Each skit is 8 minutes long. If Colby's video is 181 minutes long, how many skits are in his video? A. 27 B. 23 C. 22 D. 17

11 months ago

(14x + 6) -(8x -3) Remove the parentheses and distribute the negative sign to both terms in the second expression. The linear expression becomes

11 months ago

(20m+3) - (7m-5)

11 months ago

0.05(50+40)

11 months ago

mal works at a photo gallery. he charges 50 dollars for a large photo and 40 dollars for a large frame. sales tax is 5%. how much total tax will a costumer pay on both?

11 months ago

factor the linear expression 50x - 30 using the greatest common factor of the terms.

11 months ago

equivalent expressions for x + 0.15x

11 months ago

− 15 7 ​ 6 1 ​ ​ − 7 10

11 months ago

Chloe gave out a survey to some students in her school about their favorite color. 219 of those surveyed said their favorite color was purple. If 73% of the students surveyed said their favorite color was purple, how many students were surveyed in total?

11 months ago

Khadija answered 174 questions correctly on her multiple choice science final and earned a grade of 87%. How many total questions were on the final exam?

11 months ago

Taub missed 14 questions on her multiple choice math final that had a total of 200 problems. What percentage of questions did Taub answer correctly?

11 months ago

A bakery sells vanilla cupcakes and mocha cupcakes. It sold 200 cupcakes in a day, and 77% of them were mocha. How many of the cupcakes sold that day were vanilla?

11 months ago

Jeriel gave out a survey to some students in his school about their favorite color. Students could choose between purple and blue. 484 of those surveyed said their favorite color was purple. 45% of the students surveyed said their favorite color was blue....

11 months ago

In art class students are mixing black and white paint to make gray paint. Nathaniel mixes 2 cups of black paint and 5 cups of white paint. Tanisha mixes 1 cup of black paint and 2 cups of white paint. Use Nathaniel and Tanisha’s percent of black paint to...

11 months ago

Jamie plays a game. She earns a 1 point for correct answers and loses 0.25 points for each incorrect answer. She gets 15 correct answer and 5 incorrect answers. what is her score for the game?

11 months ago

Six friends go to a sandwich shop. All six people order the combanation meal, which includes a drink and veggie wrap for $4.95. One person thinks the total bill for all six friends will be $20.00. Is this a reasonable estimate? why?

11 months ago

sheldon gets paid $4 per hour to babysit his cousin. this weekend, he babysat on both Saturday and Sunday. he made a total of $56. sheldon babysat for 8 hours on Sunday. for how many hours did he babysit on Saturday? let x=hours spent babysitting on satur...

11 months ago

Brice had twice as many stamps in his collection as his friends Anthony and paul combined. Paul has 32 stamps in his collection. Brice has 96 stamps in his collection. how many stamps does Anthony have in his collection? the equation 2(x+32) = 96 models t...

11 months ago

the skateboard rita would like to buy costs $6 less than 3 times the amount she has saved. The skateboard costs $69. How much money does Rita have saved.

11 months ago

the perimeter of a rectangle is 40 cm. the width is 14 cm. let x= length of rectangle. use the model 2(x+14) = 40 to solve.

11 months ago

the perimeter of a rectangle is 40 cm. the width is 14 cm. let x= length of rectangle. use the model 2x + 28 = 40 to solve the solution.

11 months ago

a new theater is being builtfor the city ballet. The balcony has 100 seats. the floor has 20 rows with x seats in each row. the number of people in the theater must be under 400 to meet fire regulations.

11 months ago

tyra's family is spending the afternoon in millersville. they plan to see a movie that is over 2 hours long and then explore the town. The movie will cost the family $36, and parking costs $4 per hour. how long will the family be able to spend in millersv...

11 months ago

Janna is playing an online trivia game. she has 50 points and earns 2 points for each correct answer. she will advance to the next round if her score is over 68 points.

11 months ago

Janna is playing an online trivia game. she has 50 points and earns 2 points for each correct answer. she will advance to the next round if her score is over 68 points. modeled in an inequality

11 months ago

create a number line for the solution 4x-36<-12

11 months ago

8(5x-2)

11 months ago

A straight line with equal divisions each division equals to quarter. The point&nbsp; quarter is highlighted. Which of the following number lines shows the correct sum of the number above and ? A. A straight line with equal divisions each division equals...

11 months ago

1/4 + 3/2

11 months ago

X axis marked from Negative 1.5 to plus 4.5. A line marked on the axis is from Negative 0.75 to plus 2.5. What is the length of the red line segment on the number line?

11 months ago

-4.75+1.75

11 months ago

103.06 + 0.97 + 28

11 months ago

-188 - 437

11 months ago

Rajani went shopping for a new pair of sneakers. Sales tax where she lives is 10%. What number should she multiply the price of the pair of sneakers by to find the total plus tax in one step?

10 months ago

The population of a city decreases by 5% per year. What should we multiply the current population by to find next year's population in one step?

10 months ago

Mamadou went shopping for a new camera because of a discount sale. He multiplied the price of the camera by 0.6 to find the price he would actually have to pay, before tax. What percent discount is the sale?

10 months ago

Fawzia went shopping for a new pair of sneakers. To find the total plus tax, she multiplied the price of the pair of sneakers by 1.0625. What percent tax did she pay?

10 months ago

To find the population of a city next year, we multiply its current population by 1.036. By what percent does the population increase per year?

10 months ago

Mohal has a loyalty card good for a discount at his local pharmacy. To find the total he has to pay, before tax, he multiplies the prices by 0.96. What percent discount does the card give?

10 months ago

Wendy buys a dress that costs $30.00. she pays 8% sales tax

10 months ago

40% of $20.00

10 months ago