I need help I don’t understand this at all

The substance was cooling down at a constant rate of 4 degrees Celsius per hour throughout the 9-hour period in the lab.

In this lab scenario, we are given that a substance was cooled by 36°C over a period of 9 hours at a constant rate. Let's denote the change in temperature as ΔT (Delta T) and the time interval as Δt (Delta t) in hours.

To find the change in temperature each hour, we can use the formula for the rate of change of temperature:

ΔT/Δt = Rate of change of temperature

Given that the total change in temperature (ΔT) is 36°C and the total time period (Δt) is 9 hours, we can now plug these values into the formula:

ΔT/Δt = 36°C / 9 hours

Simplifying this, we get:

ΔT/Δt = 4°C/hour

So, the change in temperature each hour, represented as ΔT/Δt, is 4°C. This means that the substance was cooling down at a constant rate of 4 degrees Celsius per hour throughout the 9-hour period in the lab.

To know more about Temperature here

https://brainly.com/question/32445661

#SPJ2

Answer:

y= -7/6x+6

y= -1/2x+8

x = -3

Step-by-step explanation:

Find the slope of the lines of the triangle. Then you can find the perpendicular  slope of that (the slope of the altitudes) by inversing it and switching the = or - sign. Then you have a point the altitude goes through (one of the vertices) and the slope. Then you can make the equation.

Answer:

The ratio between won and lost is [tex]\frac{7}{4}[/tex]

Step-by-step explanation:

The question in English is

A table tennis team won 21 games and lost 12 games, what is the ratio between won and lost?

Let

x ------> the number of games won

y -----> the number of games lost

we have

[tex]x=21\ games[/tex]

[tex]y=12\ games[/tex]

we know that

To find the ratio divide the number of games won by the number of games lost

so

[tex]\frac{x}{y}[/tex]

substitute the values

[tex]\frac{21}{12}[/tex]

Simplify

[tex]\frac{7}{4}[/tex]

Answer:

See below.

Step-by-step explanation:

Cost of tickets = number of tickets *  cost of 1 ticket

The number of tickets purchased was  675/15 = 45.

a. C = 15n   .

b. Constant of proportionality is 15.

Answer: $675 + $15 =

Step-by-step explanation:

first add the 5 and 5 together drop the zero carry the one then add 1 and 7 plus 1 which is 9 then add 6 plus zero and ur answer should be 690

Answer:

It would be -22, not 22%. She is $22 in debt, which is why it is negative.

Answer:

no solution

Step-by-step explanation:

30n-18+2n-14-64=30n-18+2n-14

32n-96=32n-32

-96=-32<-----false statement, therfore it is no solution

Answer:

The answer is D

Step-by-step explanation:

Answer:

see the explanation

Step-by-step explanation:

we have

[tex]\frac{2}{28}=\frac{7}{8}[/tex]

we know that

To cross multiply, start by multiplying the numerator of the left-hand fraction by the denominator of the right-hand fraction.

2(8)

Then, multiply the numerator of the right-hand fraction by the denominator of the left-hand fraction.

7(28)

Next, set the 2 products equal to each other.

2(8)=7(28)

P=3L-3W

Move -3W to the other side. Sign changes to +3W

P+3W=3L-3W+3W

P+3W=3L

Divide both sides by 3 to get L by itself

P/3+3W/3=3L/3

Cross out 3 and 3, divide by 3 and then becomes 1*1*W=W

Cross out 3 and 3, divide by 3 and then becomes 1*1*L=L

P/3+W=L

Answer:

L=P/3+W

Answer:

0

Step-by-step explanation:

-y₁ + y₂\-x₁ + x₂ = m

[tex] \frac{ - 2 + 2}{9 + 7} = \frac{0}{16} = 0[/tex]

I am joyous to assist you anytime.

Answer:

r= 6p + 20

Step-by-step explanation:

given:

r= 3n + 20

also given that n = 2p

substituting n=2p into the above equation

r= 3n + 20

r= 3(2p) + 20

r= 6p + 20

Answer:

Step-by-step explanation:

u keep multiplying see 2*2= 4*4=16*16=256*256=65536*65536= etc

Answer:

plato: 1,024

Step-by-step explanation:

Final answer:

Approximately 17.12% of the U.S. is worked for food production.

Explanation:

The U.S. is 3.794 million square miles in total. Approximately 650,000 square miles are worked for food production. To find out the percent of the U.S. that is worked for food production, divide the area worked for food production by the total area of the U.S. and then multiply by 100.

Percentage = (Area worked for food production / Total area of the U.S.) x 100

Percentage = (650,000 / 3,794,000) x 100 = 17.12%

Answer:

x = -7

Step-by-step explanation:

- 23 = 5 + 4x

- 5   = - 5

- 28 = 4x

/4     = /4

- 7 = x

Answer: x= -7

Step-by-step explanation:

you basically add 5 with 5 and they cancel out

You add 5 to -23 and get -28=4x and divide 4x and -28 which gets your answer

Final answer:

Cindy drew a total of 312 pictures over two years, calculating from three pictures per week for 52 weeks each year, then doubling the result for the two years.

Explanation:

To calculate the total number of pictures Cindy drew over two years, we start by determining the number of pictures she draws each week.

Since Cindy draws three pictures each week, we multiply that number by the number of weeks in one year.

There are 52 weeks in one year.

So, the number of pictures Cindy draws in one year is:

Since the question is about a two-year period, we multiply the annual amount of pictures by two:

Therefore, Cindy drew a total of 312 pictures over two years.

Answer:

B

Step-by-step explanation:

The solution to the inequality 6x–5>4x–7 is x > -1. The given numbers that are larger than -1 are 1 and 0, which leaves -1 and -2. From these, -1 is the only given number that is not greater than -1, so it is the number that is not a solution to the inequality.

To begin, let's simplify the given inequality, 6x–5>4x–7. Subtract 4x from each side to isolate x terms on one side, obtaining 2x - 5 > -7. Then, add 5 to both sides to isolate the term with x, obtaining the inequity 2x > -2.

Finally, divide by 2 to find x > -1. So any value greater than -1 would be a solution to the inequality.

Reviewing the options:

However, according to the question we need to find the number that is not a solution, so the answer is C) -1.

https://brainly.com/question/30231017

#SPJ3

Answer:

2.967741935

Step-by-step explanation:

Answer:

19

Step-by-step explanation:

15-(-36/9)

15 + 4

19

Answer:

11

Step-by-step explanation:

36/-9 can be reduced to -4

15--(-4) is the same as 15+(-4) which is the same as 15-4

15-4=11

Answer:

Yes

Step-by-step explanation:

There hasn't been a chemical change, rather, just a physical change. All that had happened was a liquid turning into a solid, which doesn't require a change in elements of the liquid itself.

Answer:

YES

Step-by-step explanation:

BECAUSE A CHEMICAL CHANGE STAYS THE SAME AND A PHYSICAL CHANGE CAN GO BACK TO NORMAL

Answer:

1.3

Step-by-step explanation:

Answer:

Step-by-step explanation:

X=1.125 hope this helps!

Answer:

32 ft

Step-by-step explanation:

3+3+13+13=

32

Perimeter = 32 ft.

Since it is a rectangle, 2 sides measure 13ft, and 2 sides measure 3 ft.

13+13=26

3+3=6

26+6=32.

Answer:

That's it... Just sum it ul

Answer:

The shares were worth $8800, when they were originally purchased.

Step-by-step explanation:

After several shares of the company's stock were sold, a profit of $1,320 was earned.

The profit was 15% over a 30 day period.

Let the original price of the shares be = x

As there was a profit of 15% on x.

We get the following expression;

[tex]0.15x=1320[/tex]

Then x = 8800

Hence, the shares were worth $8800, when they were originally purchased.

Answer:

N/A

p-by-step explanation:

x minus 1 is already a simplified expression (can only be solved if you know x)

Answer: Orlando mixed five pounds of cereal squares and 25 pounds of nuts.

Answer:

5 lbs cereal squares.

25 Ibs nuts.

Step-by-step explanation:

Let x be the weight of nuts in pounds and y be the weight of cereal squares in pounds.

Total weight of the party mix is 30 pounds.

[tex]x+y=30[/tex]              ..... (1)

It is given that,

Cost of nuts = $7 per pound

Cost of cereal = $4 per pound

The cost of mix = $6.50 per pound.

[tex]7x+4y=6.50\times 30[/tex]

[tex]7x+4y=195[/tex]          ..... (2)

Substitute the value of x in equation (2) from equation (1).

[tex]7(30-y)+4y=195[/tex]

[tex]210-7y+4y=195[/tex]

[tex]-3y=195-210[/tex]

[tex]-3y=-15[/tex]

Divide both sides by -3.

[tex]y=5[/tex]

Substitute y=5 in equation (1).

[tex]x+5=30[/tex]

Subtract both sides by 5.

[tex]x=30-5[/tex]

[tex]x=25[/tex]

Therefore, he use 25 lbs of nuts and 5 lbs cereal squares for party mix.

Answer:

x = - 2

Step-by-step explanation:

(f + g)(x) = f(x) + g(x)

f(x) + g(x) = x² - 2x + 6x + 4 = x² + 4x + 4

Equating to zero, that is

x² + 4x + 4 = 0 ← left side is a perfect square

(x + 2)² = 0, thus

x + 2 = 0 ⇒ x = - 2

Answer:

[tex]\boxed{\text{x = -2}}[/tex]

Step-by-step explanation:

ƒ(x) = x² - 2x

g(x) = 6x + 4

(f + g)(x) = x² - 2x + 6x + 4 = x² + 4x + 4  

[tex]\begin{array}{rcr}x^{2} + 4x + 4 & = & 0\\(x + 2)^{2} & = & 0\\x+2 & = & 0\\x & = & \mathbf{-2}\\\end{array}[/tex]

[tex](f + g)(x) = 0 \text{ when } \boxed{\textbf{x = -2}}[/tex]

Check:

[tex]\begin{array}{rcl}(-2)^{2} + 4(-2) + 4 & = & 0\\4 - 8 + 4 & = & 0\\0 & = & 0\\\end{array}[/tex]

OK.

Answer:

B. [tex]y= 5 - \frac{5}{7} x[/tex]

Step-by-step explanation:

okay, so you are trying to get y alone on one side. The first thing you want to do is try to get 7y alone on one side. You do that my subtracting 5x on both sides. You get 7y = 5x +35

Then you divide 7 on both sides and get y = -5/7x + 5

The equation 5x + 7y = 35, when solved for y, is y = (35 - 5x) / 7.

The correct option is B.

To solve the equation 5x + 7y = 35 for y, we need to isolate y on one side of the equation.

Let's begin by subtracting 5x from both sides:

5x + 7y - 5x = 35 - 5x

The 5x terms cancel out on the left side, leaving us with:

7y = 35 - 5x

Now, to isolate y, we divide both sides of the equation by 7:

(7y) / 7 = (35 - 5x) / 7

Simplifying further, we have:

y = (35 - 5x) / 7

Therefore, the equation 5x + 7y = 35, when solved for y, is y = (35 - 5x) / 7.

Learn more about Equation here:

https://brainly.com/question/29657983

#SPJ2

Answer:

$34.50 saved

Step-by-step explanation:

230 - 15% = $195.5

230 - 195.5 = 34.5 saved