Geologists working to determine the effects of acid rain on aquatic ecosystems would most likely track:
pH levels
Monitoring the pH levels of surface waters allows geologists to assess the acidity of the water, which is a direct indicator of the impact of acid rain on aquatic environments. Acid rain can lower the pH of lakes and streams, which can harm or kill fish and other aquatic organisms, as well as affect the broader ecosystem.
Geologists working for the Environmental Protection Agency monitor surface waters at sites across the country to determine the effects of acid rain on aquatic ecosystems. What type of information would the geologists most likely track?(1 point)
Responses
gas emissions
gas emissions
human activity
human activity
climate patterns
climate patterns
pH levels
pH levels
21 answers
A student makes the following table in a science notebook.
Energy Resource Airborne Toxin Water Pollution Global Warming
coal x x x
oil x x x
natural gas x x x
What would be the best title for the table?
(1 point)
Responses
Causes of Acid Rain
Causes of Acid Rain
Effects of Radioactive Waste
Effects of Radioactive Waste
Effects of Burning Fossil Fuels
Effects of Burning Fossil Fuels
The Greenhouse Effect
Energy Resource Airborne Toxin Water Pollution Global Warming
coal x x x
oil x x x
natural gas x x x
What would be the best title for the table?
(1 point)
Responses
Causes of Acid Rain
Causes of Acid Rain
Effects of Radioactive Waste
Effects of Radioactive Waste
Effects of Burning Fossil Fuels
Effects of Burning Fossil Fuels
The Greenhouse Effect
The best title for the table would be:
Effects of Burning Fossil Fuels
The table lists coal, oil, and natural gas (which are all fossil fuels) and correlates their use with the production of airborne toxins, water pollution, and their contribution to global warming—all of which are consequences associated with the combustion of fossil fuels.
Effects of Burning Fossil Fuels
The table lists coal, oil, and natural gas (which are all fossil fuels) and correlates their use with the production of airborne toxins, water pollution, and their contribution to global warming—all of which are consequences associated with the combustion of fossil fuels.
What is a major drawback of nuclear energy?(1 point)
Responses
increases air pollution
increases air pollution
erodes soil
erodes soil
depletes clean water supplies
depletes clean water supplies
creates radioactive waste
creates radioactive waste
Responses
increases air pollution
increases air pollution
erodes soil
erodes soil
depletes clean water supplies
depletes clean water supplies
creates radioactive waste
creates radioactive waste
A major drawback of nuclear energy is that it:
creates radioactive waste
Radioactive waste from nuclear power plants consists of materials that remain radioactive and hazardous for thousands of years and must be carefully stored and managed to avoid environmental contamination and risks to human health.
creates radioactive waste
Radioactive waste from nuclear power plants consists of materials that remain radioactive and hazardous for thousands of years and must be carefully stored and managed to avoid environmental contamination and risks to human health.
Which energy resource is a nonrenewable energy source?(1 point)
Responses
solar
solar
water
water
oil
oil
wind
wind
Responses
solar
solar
water
water
oil
oil
wind
wind
Among the options provided, the nonrenewable energy source is:
oil
Oil is a fossil fuel, and once it is extracted and used, it cannot be replenished on a human timescale. Solar, water (hydropower), and wind are considered renewable energy sources because they are naturally replenished on a relatively short timescale.
oil
Oil is a fossil fuel, and once it is extracted and used, it cannot be replenished on a human timescale. Solar, water (hydropower), and wind are considered renewable energy sources because they are naturally replenished on a relatively short timescale.
Ten less than twice a number is equal to at least 52. What are all the possible values of the number? Write an inequality that could be used to solve this problem. Use the letter x as the variable, and write the inequality so that the x term comes first. Do not solve the inequality.
Note: You will find the option to add a >
, <
, ≥
, or ≤
symbol in the Comparison (<)
keyboard.
(1 point)
Note: You will find the option to add a >
, <
, ≥
, or ≤
symbol in the Comparison (<)
keyboard.
(1 point)
To write the inequality for the given statement "Ten less than twice a number is equal to at least 52," you can follow these steps:
1. Let the number be represented by the variable \( x \).
2. Twice the number is \( 2x \).
3. Ten less than twice the number is \( 2x - 10 \).
4. This value is at least 52, which means it is greater than or equal to 52.
Putting it all together, you get the inequality:
\( 2x - 10 \geq 52 \)
1. Let the number be represented by the variable \( x \).
2. Twice the number is \( 2x \).
3. Ten less than twice the number is \( 2x - 10 \).
4. This value is at least 52, which means it is greater than or equal to 52.
Putting it all together, you get the inequality:
\( 2x - 10 \geq 52 \)
The sum of 4.5 and one-third a number is equal to at most 38.9. What are all the possible values of the number? How would you write an inequality that could be used to solve this problem?(1 point)
Responses
1/3 n+4.5≤38.9, where n is equal to the number.
Start Fraction 1 over 3 end fraction n plus 4.5 less than or equal to 38.9 , where n is equal to the number.
1/3 n+4.5=38.9, where n is equal to the number.
Start Fraction 1 over 3 end fraction n plus 4.5 equals 38.9 , where n is equal to the number.
1/3 n+4.5≥38.9, where n is equal to the number.
Start Fraction 1 over 3 end fraction n plus 4.5 greater than or equal to 38.9 , where n is equal to the number.
4.5+13+n≤38.9, where n is equal to the number.
Responses
1/3 n+4.5≤38.9, where n is equal to the number.
Start Fraction 1 over 3 end fraction n plus 4.5 less than or equal to 38.9 , where n is equal to the number.
1/3 n+4.5=38.9, where n is equal to the number.
Start Fraction 1 over 3 end fraction n plus 4.5 equals 38.9 , where n is equal to the number.
1/3 n+4.5≥38.9, where n is equal to the number.
Start Fraction 1 over 3 end fraction n plus 4.5 greater than or equal to 38.9 , where n is equal to the number.
4.5+13+n≤38.9, where n is equal to the number.
To represent this problem as an inequality, you should set up the expression to reflect the sum of 4.5 and one-third of a number being at most 38.9. The variable, let's say "n" or "x", will represent the number. Since "at most 38.9" suggests that the sum could be less than or equal to 38.9, the inequality will include the "less than or equal to" symbol (≤).
The correct expression is:
1/3 n + 4.5 ≤ 38.9, where n is equal to the number.
In this inequality, 1/3 n represents one-third of the number, we add 4.5 to this third, and the sum should be less than or equal to 38.9.
The correct expression is:
1/3 n + 4.5 ≤ 38.9, where n is equal to the number.
In this inequality, 1/3 n represents one-third of the number, we add 4.5 to this third, and the sum should be less than or equal to 38.9.
The library needs at least 15 people to sign up for an event in order to run it. Currently, 3 people have signed up, and the library expects 2 more people to sign up each day. After how many days will the library be sure it can run the event? Write an inequality that could be used to solve this problem.(1 point)
Responses
2d+3≤15, where d is the number of days.
2 d plus 3 less than or equal to 15 , where d is the number of days.
3d+2≥15, where d is the number of days.
3 d plus 2 greater than or equal to 15 , where d is the number of days.
2d+3≥15, where d is the number of days.
2 d plus 3 greater than or equal to 15 , where d is the number of days.
3d+2≤15, where d is the number of days.
Responses
2d+3≤15, where d is the number of days.
2 d plus 3 less than or equal to 15 , where d is the number of days.
3d+2≥15, where d is the number of days.
3 d plus 2 greater than or equal to 15 , where d is the number of days.
2d+3≥15, where d is the number of days.
2 d plus 3 greater than or equal to 15 , where d is the number of days.
3d+2≤15, where d is the number of days.
The inequality that describes this problem is:
2d + 3 ≥ 15, where d is the number of days.
The term 2d represents the 2 additional people that sign up each day, and 3 is the number of people who have already signed up. The library needs at least 15 people, so the number of people signed up must be greater than or equal to 15 in order to run the event.
2d + 3 ≥ 15, where d is the number of days.
The term 2d represents the 2 additional people that sign up each day, and 3 is the number of people who have already signed up. The library needs at least 15 people, so the number of people signed up must be greater than or equal to 15 in order to run the event.
The sum of 4.6 and one-third a number is equal to at most 39.1. What are all the possible values of the number? Artem wrote the inequality 1/3n+4.6≤39.1 , where n equals the number, to help solve this problem. Solve his inequality.(1 point)
Responses
n≤131.1
n less than or equal to 131.1
n≤11.5
n less than or equal to 11.5
n≤112.7
n less than or equal to 112.7
n≤103.5
Responses
n≤131.1
n less than or equal to 131.1
n≤11.5
n less than or equal to 11.5
n≤112.7
n less than or equal to 112.7
n≤103.5
Let's solve the inequality:
\( \frac{1}{3}n + 4.6 \leq 39.1 \)
First, we need to isolate \( n \) on one side of the inequality.
Step 1: Subtract 4.6 from both sides of the inequality.
\( \frac{1}{3}n \leq 39.1 - 4.6 \)
\( \frac{1}{3}n \leq 34.5 \)
Step 2: To solve for \( n \), multiply both sides by 3 (which is the reciprocal of \( \frac{1}{3} \)).
\( n \leq 34.5 \times 3 \)
\( n \leq 103.5 \)
So the correct answer is:
n ≤ 103.5 (n is less than or equal to 103.5)
\( \frac{1}{3}n + 4.6 \leq 39.1 \)
First, we need to isolate \( n \) on one side of the inequality.
Step 1: Subtract 4.6 from both sides of the inequality.
\( \frac{1}{3}n \leq 39.1 - 4.6 \)
\( \frac{1}{3}n \leq 34.5 \)
Step 2: To solve for \( n \), multiply both sides by 3 (which is the reciprocal of \( \frac{1}{3} \)).
\( n \leq 34.5 \times 3 \)
\( n \leq 103.5 \)
So the correct answer is:
n ≤ 103.5 (n is less than or equal to 103.5)
Twelve less than four-fifths of a number is more than 24. What are all the possible values of the number? Lucia wrote the inequality 4/5 n−12>24 , where n equals the number, to help solve this problem. Solve her inequality.(1 point)
Responses
n>15
n greater than 15
n>9.6
n greater than 9.6
n>28.8
n greater than 28.8
n>45
Responses
n>15
n greater than 15
n>9.6
n greater than 9.6
n>28.8
n greater than 28.8
n>45
Let's solve Lucia's inequality to find the possible values of \( n \):
\( \frac{4}{5}n - 12 > 24 \)
First, add 12 to both sides:
\( \frac{4}{5}n > 24 + 12 \)
\( \frac{4}{5}n > 36 \)
Next, to solve for \( n \), multiply both sides by the reciprocal of \( \frac{4}{5} \), which is \( \frac{5}{4} \):
\( n > 36 \times \frac{5}{4} \)
\( n > 9 \times 5 \)
\( n > 45 \)
Therefore, the possible values of \( n \) are those that are greater than 45. The correct response is:
n > 45 (n is greater than 45)
\( \frac{4}{5}n - 12 > 24 \)
First, add 12 to both sides:
\( \frac{4}{5}n > 24 + 12 \)
\( \frac{4}{5}n > 36 \)
Next, to solve for \( n \), multiply both sides by the reciprocal of \( \frac{4}{5} \), which is \( \frac{5}{4} \):
\( n > 36 \times \frac{5}{4} \)
\( n > 9 \times 5 \)
\( n > 45 \)
Therefore, the possible values of \( n \) are those that are greater than 45. The correct response is:
n > 45 (n is greater than 45)
What is 24,000 times 10,000
To multiply 24,000 by 10,000, you can simply multiply the numbers without considering the zeros and then add the zeros back at the end.
24,000 times 10,000 is:
24 (without the trailing zeros) times 10 (without the trailing zeros) equals 240.
Now add the combined number of zeros from both numbers to the product. There are three zeros in "24,000" and four zeros in "10,000," giving a total of seven zeros.
So, \( 24,000 \times 10,000 = 240,000,000 \).
24,000 times 10,000 is:
24 (without the trailing zeros) times 10 (without the trailing zeros) equals 240.
Now add the combined number of zeros from both numbers to the product. There are three zeros in "24,000" and four zeros in "10,000," giving a total of seven zeros.
So, \( 24,000 \times 10,000 = 240,000,000 \).
Ellie is saving to buy a phone. She wants to have at least $299 saved before buying one. She currently has $213 saved, and she receives $10 a week as an allowance from her parents. After how many weeks will Ellie have enough money saved? Ellie writes the inequality 10w+213≥299 , where w is the number of weeks, to help figure this out. Solve her inequality.(1 point)
Responses
w≥8.6
w greater than or equal to 8.6
w≥51.2
w greater than or equal to 51.2
w≥86
w greater than or equal to 86
w≥860
Responses
w≥8.6
w greater than or equal to 8.6
w≥51.2
w greater than or equal to 51.2
w≥86
w greater than or equal to 86
w≥860
To solve the inequality \( 10w + 213 \geq 299 \), where \( w \) is the number of weeks, subtract 213 from both sides to isolate the term with \( w \):
\( 10w \geq 299 - 213 \)
\( 10w \geq 86 \)
Now, divide both sides by 10 to solve for \( w \):
\( w \geq \frac{86}{10} \)
\( w \geq 8.6 \)
Since Ellie can't save for a fraction of a week, we would round up to the next whole week. Therefore, the smallest whole number that \( w \) could be is 9.
So, it will take at least 9 weeks for Ellie to have enough money saved to buy the phone. The correct response is:
w ≥ 8.6 (w is greater than or equal to 8.6), but since \( w \) must be a whole number, the practical answer is that \( w \) must be at least 9 weeks.
\( 10w \geq 299 - 213 \)
\( 10w \geq 86 \)
Now, divide both sides by 10 to solve for \( w \):
\( w \geq \frac{86}{10} \)
\( w \geq 8.6 \)
Since Ellie can't save for a fraction of a week, we would round up to the next whole week. Therefore, the smallest whole number that \( w \) could be is 9.
So, it will take at least 9 weeks for Ellie to have enough money saved to buy the phone. The correct response is:
w ≥ 8.6 (w is greater than or equal to 8.6), but since \( w \) must be a whole number, the practical answer is that \( w \) must be at least 9 weeks.
1 answer