Last month, Mr. Douglas sold 36 of his books. This month, however, he only sold 8 books. What was the percent change in book sales from last month to this month?

A decrease of 77.77%
An increase of 3.5%
A decrease of 3.5%
An increase of 77.77%

Answer:

\(x\leq \frac{7}{2}\)

Step-by-step explanation:

To get this answer, you would need to divide 2 from both sides.

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Since 2 can't go into 7 respectfully, it would remain 7 over 2 unless converted into a decimal which is 3.5 [Which would make the answer x ≤ 3.5]

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Hence, the answer would be 7/2 as it's final answer

This is a system of three equations with two unknowns, x and y. To solve it, we can use the method of elimination. First, we can eliminate y by subtracting the first equation from the second equation:

x^2-2y=3 - (x-2y=3) => x^2-x=0

Then we can factor the resulting equation and find the values of x:

x^2-x=0 => x(x-1)=0 => x=0 or x=1

Next, we can substitute these values of x into any of the original equations and find the corresponding values of y. For example, using the first equation:

x-2y=3 => 0-2y=3 => y=-3/2 when x=0 x-2y=3 => 1-2y=3 => y=-1 when x=1

Finally, we can substitute these values of x and y into the expression x2y-2xy2 and evaluate it:

x2y-2xy2 => 02(-3/2)-2(0)(-3/2)2 => 0 when x=0 and y=-3/2 x2y-2xy2 => 12(-1)-2(1)(-1)2 => -3 when x=1 and y=-1

Therefore, the value of x2y-2xy2 can be either 0 or -3 depending on the values of x and y.

Based on the given information, where there are 7 blue marbles and 3 purple marbles, and assuming the selection process is random and each marble has an equal chance of being selected, the best prediction for the number of times you will pick a blue or a purple marble can be calculated as follows:

Out of the 60 selections, we can expect to pick a blue marble approximately 7/10 times (since there are 7 blue marbles out of a total of 10 marbles). Therefore, the best prediction for the number of times you will pick a blue marble is around 60 * (7/10) = 42 times.

Similarly, we can expect to pick a purple marble approximately 3/10 times (since there are 3 purple marbles out of a total of 10 marbles). Therefore, the best prediction for the number of times you will pick a purple marble is around 60 * (3/10) = 18 times.

Hence, the best prediction is that you will pick a blue marble around 42 times and a purple marble around 18 times out of the 60 selections.

~~~Harsha~~~

Answer:

18 times

Step-by-step explanation:

If there are 7 blue marbles and 3 purple marbles, the probability of selecting a blue marble is 7/10, and the probability of selecting a purple marble is 3/10.

Since you're selecting marbles without replacement, the probability will change with each pick. To calculate the best prediction for the number of times you will pick a blue or purple marble, we can multiply the probabilities by the number of picks.

Expected number of blue marbles picked: (7/10) * 60 = 42

Expected number of purple marbles picked: (3/10) * 60 = 18

Therefore, the best prediction is that you will pick a blue marble approximately 42 times and a purple marble approximately 18 times when selecting marbles without looking 60 times.

I’m pretty sure the answer should be 1,710 if not i’m sorry

Answer:

1710 fish

Step-by-step explanation:

Let the number of fish in the lake last year be 'x'

The equation becomes-
x + 15x/100=6210     (This is because 15% of x is added in x to become    
6210... hope you understand)

x + 15x/100 = 6210
115x/100 = 6210
23x/20 = 6210
x = 6210 * 20/23
x = 270 * 20
x = 5400

Therefore- The number of fish last year = 5400


Now, let the number of fish in the lake 2 years ago be 'y'

The equation becomes-
y + 20y/100 = 5400     (Same logic as last time)

y + 20y/100 = 5400
120y/100 = 5400
24y/20 = 5400
6y/5 = 5400
y = 5400 * 5/6
y = 900 * 5
y = 4500

Therefore- Fish in the lake two years ago = 4500 fish

Difference between current and two years ago = 6210-4500
                                                                               = 1710 fish

Hope you understood the answer and I hope it helps you :)

Answer:

to find area, multiply the two sides together. since it tells us that this is a square we can assume both sides are the same length (315.2). multiply 315.2 and 315.2, and you get 99,351.04.

Answer:

1/125—> 5tothepowerof-3

-1/125> -5tothepowerof-3

-125>(-5tothepowerof-3) tothepowerof-1

1> (-5tothepowerof-3)tothepowerof0

Step-by-step explanation:

Answer:

Multiply the rate per hour by the number of hours (n) and add the deposit.

A)

Bike shop x: c = 2.75n + 3.00

Bike shop z: c = 1.75n + 7.00

B) to find when they will cost the same set the equations equal to each other and solve for n:

2.75n + 3.00 = 1.75n + 7.00

Subtract 3 from each side:

2.75n = 1.75n + 4.00

Subtract 1.75n from both sides:

1.00n = 4.00

Divide both sides by 1:

n = 4 hours

Answer:

Step-by-step explanation:

a = \(\sqrt{12^2 -9^2} = \sqrt{144-81} = \sqrt{63}\)

We use the minus because we are searching a leg.

A leg is always shorter than the hypotenuse

Answer:

a = 7.9 or a = √63

Step-by-step explanation:

a² + b² = c²

(The two shorter sides of a triangle are always a and b while the longer side will always be c)

So, here the longer side of this triangle is 12 and the shorter sides are 9 and a (unknown).

The equation is: a² + 9² = 12²

But to find the value of a, the formula will be 12² - 9² = a²

12² - 9² = a²

144 - 81 = a²

63 = a²

the square root of 63 = 7.9    so that means a = 7.9

Answer:

By power of a point, AC⋅CB=DC⋅CE. That is, 12⋅12=6⋅(2R–6).

Then, R=15.

Answer:

5.67

Step-by-step explanation:

Answer:

1/2 + 1/4x

Step-by-step explanation:

\( \frac{2}{3} - \frac{1}{4} x + \frac{1}{2} x - \frac{1}{6} = \frac{4 - 1}{6} + \frac{2 - 1}{4} x = \frac{3}{6} + \frac{1}{4} x = \frac{1}{2} + \frac{1}{4} x\)

Answer:

Step-by-step explanation:

1. 6+11< or equal to 17. X has to be 11 or less

2. 4(3)> or equal to 12. X has to be 3 or up

3. t=63> 8. X has to be less than 64

hope this helps :)

Answer:I think 2/5 but I’m not 100% sure tell me if I’m wrong

Step-by-step explanation:

Answer:

31/24 or 1 7/24

Step-by-step explanation:

Answer:

D) \(\frac{31}{24}\) or \(1\frac{7}{24}\)

Step-by-step explanation:

Step 1: Convert to numeral form

\(\frac{2}{3}+\frac{5}{8}\)

Step 2: Find a common denominator (multiply denominators then cross-multiply)

\(\frac{16}{24}+\frac{15}{24}\)

Step 3: Add numerators (and leave denominators the same)

\(\frac{31}{24}\) or \(1\frac{7}{24}\)

Hope this helped you!

Answer:She could offer 8 different ice cream desserts

Step-by-step explanation:

Answer:

8

Step-by-step explanation:

2 x 2 x 2 = 8

12.6

this is the answer

Answer:

The answer is D.

Step-by-step explanation:

y = mx + b

C = 5/9 (F - 32)

C = 5/9F - 5/9 (32)

Option (D) is correct.

Answer:

7$x(the number of students)=(cost)

7$x26=182$

Step-by-step explanation:

if there are 26 kids going and each cost 7$ all you need to do is times the amount if students by the cost of each student

Answer:

  $1200

Step-by-step explanation:

You want to know the amount borrowed at 7.2% if the simple interest for one year is $86.40.

The interest formula is ...

  I = Prt

where P is the amount borrowed, r is the interest rate, and t is the number of years.

Using the given values, we have ...

  86.40 = P·0.072·1

  P = 86.40/0.072 . . . . . . divide by the coefficient of P

  P = 1200

You have borrowed $1200.

Answer: 1200

Step-by-step explanation: Linear equation. 7.2x = 100(86.40). then divide by 7.2 on each side. x=1200

Answer:

0,8

Step-by-step explanation:

10/8=0,8

Answer:

The scale factor is 1.25

Step-by-step explanation:

10/8 =1.25

(1.25 x 8 =10)

Hope this helps!

Answer: Where is the question?

Step-by-step explanation:

I'm sorry, I'm not sure what you mean. Could you please clarify which questions you are referring to and what you would like me to add together?

Answer:

192 hours per day / 8 hours per person per day = 24 people

Step-by-step explanation:

Assuming each person works for 8 hours a day, the total number of hours needed to complete the project is:

720 person-days x 8 hours = 5,760 hours

To complete the project in 30 days, the total number of hours needed per day is:

5,760 hours / 30 days = 192 hours per day

Answer:

A I hope it helps

Step-by-step explanation:

Answer:

Y = 3x-2

Step-by-step explanation:

Gradient: 3

Y entercpt (sorry can’t spell lol) : -2

Answer:

y=3x-2

Step-by-step explanation:

Negative 3, negative 2.4, negative 1.5, negative 2 and one-fourth, negative 1 and one-eighth

Hope my answer helps you✌️