I need to know the answer to part b please

Answer:

19%

Step-by-step explanation:

An exponential relationship is modeled by y = 31(0.81)^x , what is the percent rate of change for this function?

From the above exponential relationship given, we can see that this exponential relationship is an exponential decrease.

Where the formula:

y = a(1 - r)^t

Where a = Initial amount

r = rate of change in percent

t = time in years

y = a(1 - r)^x = y = 31(0.81)^x

1 - r = 0.81

r = 1 - 0.81

r = 0.19

Converting 0.19 × 100

= 19%

Answer:

19.2

Step-by-step explanation:

Cross multiply to get 96=5n

n=19.2

Answer:

n= 96/5 or 19.2 or 19 1/5

Step-by-step explanation:

Answer:

Area of triangle ABC = 10

Option C is correct.

Step-by-step explanation:

We need to find area of triangle ABC

We are given A(2,1) B(4,7) and C(6,3)

The formula used to find [tex]Area \ of \ triangle=\frac{1}{2}base\times height[/tex] ABC is:

In the given triangle base= AC and height = BC

First we need to find the distance between A and C and B and C

The formula used to find distance between AC [tex]Distance=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]

We have [tex]x_1=2, y_1=1, x_2=6, y_2=3[/tex]

Putting values and finding distance

[tex]Distance=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\\Distance=\sqrt{(6-2)^2+(3-1)^2}\\Distance=\sqrt{(4)^2+(2)^2}\\Distance=\sqrt{16+4}\\Distance=\sqrt{20}[/tex]

find distance between BC [tex]Distance=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]

We have [tex]x_1=4, y_1=7, x_2=6, y_2=3[/tex]

Putting values and finding distance

[tex]Distance=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\\Distance=\sqrt{(6-4)^2+(3-7)^2}\\Distance=\sqrt{(2)^2+(4)^2}\\Distance=\sqrt{4+16}\\Distance=\sqrt{20}[/tex]

So, We have height = [tex]\sqrt{20}[/tex] and base = [tex]\sqrt{20}[/tex]

Finding area of triangle

[tex]Area \ of \ triangle=\frac{1}{2}base\times height\\Area \ of \ triangle=\frac{1}{2}\sqrt{20} \times \sqrt{20} \\Area \ of \ triangle=\frac{1}{2}\times 20\\Area \ of \ triangle=10[/tex]

So, Area of triangle ABC = 10

Option C is correct.

Answer:

fghjgfvgh

yguhyu

Step-by-step explanation:

Answer:

frank traveled 2760-1400 = 1360 miles

traveled 16 hours

This means he drove: 1360 miles / 16 hours = 85 miles per hour.

Answer: I believe it’s D

Step-by-step explanation:

Answer:

2ft

Step-by-step explanation:

Answer:

2 ft

Step-by-step explanation:

The triangle has a dilation of 1/3 and we can assume that the triangles are congruent

So we take 6 and divide it by 3 and get 2

The answer is 2 ft

Answer:

B. y = -6

Step-by-step explanation:

As you can see the graph I done is perpendicular

Answer:

B

Step-by-step explanation:

A line perpendicular to the y- axis is a horizontal line parallel to the x- axis, with equation

y = c ( where c is the value of the y- coordinates the line passes through )

The only equation in this form is

y = - 6 → B

Answer:

4.87 to the fourth power

Step-by-step explanation:

0.000487 in Scientific Notation:

4.87  * 10^-4

Answer:

Step-by-step explanation:

Answer:

- 749.5i + 10821.5

−2669.5

−4168.5

Step-by-step explanation:

Given tgat:

Number of stores in 2003 (y2) = 1078

Number of stores in 1999 (y1) = 4076

1999 = i = 9

2003 = 13

y - y1 = m(x - x1)

m = slope = (y2 - y1) / (i2 - i1)

m = (1078 - 4076) / 13 - 9

m = - 2998 / 4

m = - 749.5

y - 4076 = - 749.5(i - i1)

y - 4076 = - 749.5(i - 9)

y - 4076 = - 749.5i + 6745.5

y = - 749.5i + 10821.5

Prediction for 2008 and 2010

2008 ; i = 18

y = - 749.5(18) + 10821.5

y = −2669.5

2010 ; i = 20

y = - 749.5(20) + 10821.5

y = − 4168.5

Answer:

Answer: 35 minutes

Step-by-step explanation:

Step-by-step explanation:

For us to solve the question, we have to calculate the amount of gallons of water that is drained every minute. This will be:

= (1320 - 1040) / (9 - 2)

= 280/7

= 40 gallons per minute

Since we are told that 1,320 gallons of water remain in the pool after 2 minutes. This means that the total water in the pool at the beginning was:

= 1320 gallons + (40 × 2)

= 1320 gallons + 80 gallons

= 1400 gallons

The time taken for the pool to be completely drained will be:

= Total water in pool / Gallons drained per minute

= 1400 / 40

= 35 minutes

Answer:

35 minutes

Step-by-step explanation:

There are 40 gallons drained per minute.

Answer:

a) $4000

b) $2000

Step-by-step explanation:

a)

interest = Principal x rate as decimal x time

interest = 20,000 x 0.05 x 4

interest = 4000

b)

interest = Principal x rate as decimal x time

interest = 20,000 x 0.05 x 2

interest = 2000

you save $2000 if you pay after 2 years

Answer:2,500

Step-by-step explanation:

9514 1404 393

Answer:

  x = 14

Step-by-step explanation:

The sum of angles in a triangle is 180°:

  ∠O +∠P +∠Q = 180°

  (2x -5)° +(3x -8)° +(10x -17)° = 180°

  15x -30 = 180 . . . . . divide by °, collect terms

  x -2 = 12 . . . . . . . . . divide by 15

  x = 14 . . . . . . . . . . . .add 2

Answer:

The mean would get bigger becuase you are adding in a bigger number there for the mean would increase.The standard deviation would change as well because then again you are adding a bigger number and standard diviation is basically the difference between the gratest and least.  For #2 no the median wouldn't chnage becuase the 70 is going in place for the 7 so it would just fill it's spot and wouldn't effect the data set.

Step-by-step explanation:

The median would be a better choice for the measure of center becuase the mean is telling you the average and the median is actully telling you where the middle of the data set is.

The mean is the average of a group of data. The data set  added up and divided by the number of data. The mean is sensitive to extreme data.

When 7 is changes to a 70 then mean and standard deviation both changes.

For the given data set median be a better choice for the measure of center than the mean because mean is sensitive to extreme data and median is the point at which half the data are above and half the data are below.

The median is the point at which half the data are above and half the data are below. Medians are less sensitive to extreme scores . Therefore, median is center point of data set.

Standard deviation shows how much variation there is from the mean. A low SD indicates that the data points tend to be close to the mean, whereas a high SD indicates that the data are spread out over a large range of values.

Learn more:

https://brainly.com/question/14532771

Answer:

D,E

Step-by-step explanation:

Answer:My suggestion is practice what you learned after each class for like 10-20 min and pay close attention in class. Wish you the best of luck.

Step-by-step explanation:

Answer:

y(2x+3y-6)

Step-by-step explanation:

2xy+ [tex]3y^{2}[/tex]-6y

Find the H.C.F

2xy= 2×x×y

3y²= 3×y×y

6y= 6×y

H.C.F= y

2xy÷y+ 3y²÷y- 6y÷y

= 2x+ 3y- 6

= y( 2x+ 3y-6)

It will take 7 minutes and 30 seconds to melt at a temperature of 40°C.

Proportions are of two types one is the direct proportion in which if one quantity is increased by a constant k the other quantity will also be increased by the same constant k and vice versa.

In the case of inverse proportion if one quantity is increased by a constant k the quantity will decrease by the same constant k and vice versa.

Given, The amount of time it takes an ice cube to melt varies inversely to the air temperature this can be written as,

Time ∝ 1/(Temparature).

Time = K(1/Temp).

At 30 degrees Celsius, the ice will melt in 10 minutes.

10 = K(1/30).

K = 300.

Now, the time required to melt the ice at 40°C is,

Time = 300(1/40).

Time = 7.5 minutes or 7 minutes 30 seconds.

learn more about proportion here :

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Answer:

a. x=100 b. x=30

Step-by-step explanation:

A: <1 and <2 are supplementary by consecutive interior angles theorem

x + x-20 = 180

2x-20=180

2x=200

x=100

B: <1 and <2 are congrunt by corresponding angles postulate

3x-5=x+55

2x=60

x=30

Answer:

The function will be: f(n) = 2n

Step-by-step explanation:

An arithmetic sequence is a sequence where the common difference between consecutive terms is same

The sequence according to given information is:

2,4,6...

Here

a_1 = 2

a_2 = 4

a_3 = 6

the common difference will be:

[tex]d = a_2-a_1 = 4-2 = 2\\d = a_3-a_2 = 6-4 = 2[/tex]

The arithmetic sequence is given by:

[tex]a_n = a_1+(n-1)d[/tex]

Putting the values

[tex]a_n = 2+(n-1)(2)\\a_n = 2+2n-2\\a_n = 2n[/tex]

Hence,

The function will be: f(n) = 2n

Answer:

A

Sorry I just have to right more to turn it in but good luck with your math work.

Answer:

give brain list first

Step-by-step explanation:

Answer:

31

Step-by-step explanation:

10-3= 7 so 3+7=10 and 10+7=17 and you just do this to find the answer

Answer:

7% of 150= 10.5 :)

Step-by-step explanation:

150/x=100/7

(150/x)*x=(100/7)*x       - we multiply both sides of the equation by x

150=14.2857142857*x       - we divide both sides of the equation by (14.2857142857) to get x

150/14.2857142857=x

10.5=x

x=10.5

now we have:

7% of 150=10.5

Answer: 1, 2, 5

Step-by-step explanation: Move the decimal two times to the left if you divide by 100.

Answer:

40%

Step-by-step explanation:

Answer:

1. w=-24

2. g=3

Step-by-step explanation:

Answer:

D. 43x + 72 ≤ 1,128

Step-by-step explanation:

She  has $1,128

Total price $72

43x since its unit rate for each

43x + 72 is less than or equal to $1,128

Answer:

D. 43x + 72 ≤ 1,128

Step-by-step explanation:

Good luck! Hope this helped :)

Answer:

y=mx+b :)

Step-by-step explanation: