If the original quantity is 10 and the new quantity is 7 what is the percent decrease?

QUESTION POSTED AT 19/02/2020 - 12:01 PM

Answered by admin AT 19/02/2020 - 12:01 PM

7 divided by 10 then subtract 100% =30
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Related questions

A population of 1,000 squirrels lives on a rectangle-shaped farm plot that is 25 feet long by 10 feet wide what is the population density

First, find the area of the plot:
25*10=250

1000/250 is 4

the population density is 4 squirrels per square foot.

ANSWERED AT 30/03/2020 - 01:30 AM


QUESTION POSTED AT 30/03/2020 - 01:30 AM

Katie bought some flower. She use 3/8 of it to bake bread. What percent of the flowers left?

62.5% of the flour left!

ANSWERED AT 29/03/2020 - 06:35 PM


QUESTION POSTED AT 29/03/2020 - 06:35 PM

Write 5/8 as a decimal and a percent. 2. At his 1st match 50% of the 312 people that fought against Po were expert fighters. At his 2nd match 40% of the 275 people were expert fighters. Which situation had more expert fighters? Any by how many more?

1. 0.625 and 62.5%
2. Match 1 had 156 expert fighters (0.5 x 312), Match 2 had 110 expert fighters (0.4x275) Match 1 had more expert fighters by 46

ANSWERED AT 29/03/2020 - 06:31 PM


QUESTION POSTED AT 29/03/2020 - 06:31 PM

40 + 20 + 10 + … ; n = 10 Find the sum of each finite geometric series.

I've attached a picture below of the formula for a finite geometric sequence. It includes an infinite geometric sequence formula for your reference, too.

a_1 = 40
r(ratio)= \frac{1}{2}
n=10

Plug in the values. 

S_{10}=40*( \frac{1- \frac{1}{2}^{10} }{1- \frac{1}{2} } )
S_{10}=40*( \frac{1- \frac{1}{1024} }{\frac{1}{2} })
S_{10}=40*( \frac{\frac{1023}{1024} }{\frac{1}{2} })
S_{10}=40*1.998046875
 S_{10} = 79.921875
S₁₀ ≈ 79.92

ANSWERED AT 29/03/2020 - 06:31 PM


QUESTION POSTED AT 29/03/2020 - 06:31 PM

Write 76% as a decimal and also a reduced fraction. 2. Master Shifu tries to discourage Po from training. He teases Po about messing up 4 out of every 10 Kung Fu moves that he tries to do. What percent of Po's moves does he mess Up?

Write 76% as a decimal and as a reduced fraction.

Decimal : 0.76

Fraction : 76/100, which then simplifies to 38/50, because you divide the numerator & denominator by 2. Then, you divide them by 2 again, and get 19/25. 

Reduced Fraction : 19/25

2) Po messes up 4 out of every 10 moves. 

So, to make this slightly easier, we're going to turn that (above) into a fraction!

Fraction : 4/10

Then, we turn it into a decimal.

To turn it into a decimal, multiply 4/10 by 10/10, so that the denominator is 100. 

Fraction: 4/10 × 10/10 = 40/100

Decimal : Because the denominator is 100, all we have to do is add a decimal marking 2 places to the left of the last digit. (0.40)

Now, because we have our decimal, we simply say that the percentage is 40%.

Why? Because if the decimal is in the hundredths place, all you need to do is take the numbers on the right side of the decimal marking, and add a percentage sign to it.

~Hope I helped!~


ANSWERED AT 29/03/2020 - 06:31 PM


QUESTION POSTED AT 29/03/2020 - 06:31 PM

Jonathan and Sarah purchased a beach house for $10,000,000. The home appreciates at a rate of 3% per year. The appreciation of the house is shown in the graph. The home is currently worth about $13,000,000. Jonathan and Sarah have owned the home for about ______ years. how many years

Current worth = 10,000,000 * (1.03)^years
We must determine the years when current worth = 13,000,000
13,000,000 / 10,000,000 = 1.03^years
1.3 = 1.03^years
Taking logs of both sides:
log (1.3) = years*log(1.03)
log(1.3) / log(1.03) = years
0.11394335231 / 0.012837224705 = years
years = 8.8760113598
Roughly about 8.9 years


ANSWERED AT 29/03/2020 - 06:29 PM


QUESTION POSTED AT 29/03/2020 - 06:29 PM

Number 9 and number 10?

IDK really, but you can ask the question on brainly.

ANSWERED AT 29/03/2020 - 06:29 PM


QUESTION POSTED AT 29/03/2020 - 06:29 PM

Which of the equation has a solution of 9. A. W-12=21 B. R- 1 = 10 C. A + 3 = 12 D. M + 9 = 81

Well C because
a+3=12
    -3    -3 
a= 9

ANSWERED AT 29/03/2020 - 06:28 PM


QUESTION POSTED AT 29/03/2020 - 06:28 PM

Show how to solve 2x^2+8x=10 by factoring

Answers are
x=-5 and x = 1

ANSWERED AT 29/03/2020 - 06:23 PM


QUESTION POSTED AT 29/03/2020 - 06:23 PM

Milo walks 40 meters in 15 seconds and Mira walks 30 meters in 10 seconds. Who's walking rate is faster?

The answer is Mira. hope this helps

ANSWERED AT 29/03/2020 - 04:30 PM


QUESTION POSTED AT 29/03/2020 - 04:30 PM

For the function f(x) = –5x, which ordered pair will be a point on the graph of the function? A. (–5, 1) B. (2, 10) C. (15, –3) D. (0, 0)

It's D: (0,0)
This is because when you put 0 in for x your y value will equal 0 and that is one of your answers, so it's the point (0,0) 

ANSWERED AT 28/03/2020 - 07:19 PM


QUESTION POSTED AT 28/03/2020 - 07:19 PM

Help me I need help 10 points and brainliest too plz answer is right

The correct answer is the last choice.

ANSWERED AT 28/03/2020 - 07:19 PM


QUESTION POSTED AT 28/03/2020 - 07:19 PM

At a carnival game, you randomly throw two darts at the board and break two balloons out of 15. What is the probability that both the balloons you break are purple? Write your answer as a fraction or percent rounded to the nearest tenth. (3 red, 4 blue, 2 green, 2 yellow, 4 purple)

Add up the total number of balloons (15) there are 4 purples so the probably of you getting purple at all is 4/15. consider that after you hit the first purple, your odds decrease to 3/14. 

ANSWERED AT 28/03/2020 - 01:00 PM


QUESTION POSTED AT 28/03/2020 - 01:00 PM

The line plot shows the results of a survey of two groups of 10 kids on how many ice cream cones they ate in the month. Which conclusion can be drawn about the data?

Answer:

The median of Group 2 is greater than the median of Group 1.

Step-by-step explanation:

ANSWERED AT 28/03/2020 - 12:48 PM


QUESTION POSTED AT 28/03/2020 - 12:48 PM

Joe has two empty boxes, one box is 15 inches wide, 20 inches long and 10 inches high. The second box has the same length and width but is 4 inches taller. How much additional spaces is in the box

Space in the box = volume
volume = length x width x height
box 1 volume = 15 x 20 x 10 = 3000
box 2 volume = 15 x 20 x 14 = 4200
how much space is left = box 2 - box 1 = 1200 inches

ANSWERED AT 28/03/2020 - 12:44 PM


QUESTION POSTED AT 28/03/2020 - 12:44 PM

When you change fractions and mixed numbers into decimals, why is the denominator always 10, or 100

So when you turn it into a decimal it has a correct place value say if you have 0.70 as a fraction it would be 70/100 because the fraction is telling you it's hundredths one tip is look at the decimal pretend it's always a 1 then in front of the decimal is all zeros and that is your denominator. Hope this helped ( :

ANSWERED AT 28/03/2020 - 12:44 PM


QUESTION POSTED AT 28/03/2020 - 12:44 PM

There are 10 boys and 13 girls in Ms. Kelso’s homeroom. She is going to select one boy and one girl to act as homeroom representatives for student council. How many different pairs of students could Ms. Kelso choose? A.) 10 B.) 23 C.) 130 D.) 230

The notation for this is {10 \choose 1} \cdot {13 \choose 1}.

Where you should know that {n \choose k} =  \frac{n!}{k!(n-k)!}

When choosing only one boy and one girl, it becomes simple-ish:

\frac{10!}{9!} \cdot \frac{13!}{12!} = 10 \cdot 13 = 130

So I would vote for C, hoping I didn't overlook anything...

ANSWERED AT 28/03/2020 - 12:41 PM


QUESTION POSTED AT 28/03/2020 - 12:41 PM

Hoshi walks 10 meters in 3 seconds. 1.What his her walking rate? 2. Suppose she walks this same rate for 50 seconds, how far does she walk? 3. Write an equation that represents the distance (d) that Hoshi walks in (t) seconds.

Her walk rate is 3.33 meter per sec you find this by dividing meters by seconds

Then you multiply this 3.33 by 50 you get 166.5 meters

d=t3.33 is the equation

ANSWERED AT 28/03/2020 - 12:39 PM


QUESTION POSTED AT 28/03/2020 - 12:39 PM

Krypton-91 is a radioactive substance that decays very quickly. The function Q(t)=Qoe^-kt models radioactive decay of krypton-91. Q represents the quantity remaining after t seconds and the decay constant k is approximately 0.07. How long will it take a quantity of krypton-91 to decay t o10% of its origional amount? round your answer to the nearest second.

Answer:

32.894 seconds ≈ 33 seconds

Step-by-step explanation:

Function : Q(t)=Q_0 e^{-kt}

The function models radioactive decay of krypton-91.

The decay constant k is approximately 0.07.

Q_0 denotes initial amount .

We are require to find How long will it take a quantity of krypton-91 to decay to 10% of its original amount

\Rightarrow 10\%\times Q_0

\Rightarrow 0.10\times Q_0

So, we neet to find t at which Q(t)=0.10 Q_0

0.10 Q_0=Q_0 e^{-0.07t}

0.10 =e^{-0.07t}

Taking log both sides

\log0.10 =-0.07t \log e

\log0.10 = -0.07t \times 0.434294481903

-1 = -0.0304006137332t

\frac{-1}{-0.0304006137332} = t

32.894= t

Thus it will take 32.894 seconds ≈ 33 seconds a quantity of krypton-91 to decay to 10% of its original amount.

ANSWERED AT 28/03/2020 - 12:28 PM


QUESTION POSTED AT 28/03/2020 - 12:28 PM

What is $1,617.12 to the nearest 10?

$1,620 to the nearest ten but to the nearest tenth its $1,612.10

ANSWERED AT 28/03/2020 - 12:27 PM


QUESTION POSTED AT 28/03/2020 - 12:27 PM

Triangle ABD is similar to triangle ACD. AB = 10, BC = 12, BE = 4, and CD = y. Find y.

There is a mistake in your writing
:The similar triangles should be ABE (& not ABD as you stated) & ACD

If so, we can write the following proportion:

AB/AC = BE/CD.
We know that AB =10, BE=4, AC= 10 + BC (BC =12, Given), so AC =22
Plug into the above: 10/22 =4/y===> y= (22 x 4)/10===> y =44/5 =8.8

ANSWERED AT 28/03/2020 - 12:25 PM


QUESTION POSTED AT 28/03/2020 - 12:25 PM

These data show the age in years of 9 members of the youth orchestra. 12 14 16 17.5 10 18 15 15.5 19 What is the IQR (interquartile range) for these data?

First quartile is 13
Third quartile is 17.75
Take 17.75 - 13 = 4.75
The IQR is 4.75

ANSWERED AT 28/03/2020 - 12:24 PM


QUESTION POSTED AT 28/03/2020 - 12:24 PM

James made 15 out of 25 free throws. Later, he made 21 out of 25 free throws. What is the percent increase?

21-15=6
6/15=0.4
0.4=40%
So the percent increase is 40%
Hope this helps!!  ^.^

ANSWERED AT 28/03/2020 - 12:24 PM


QUESTION POSTED AT 28/03/2020 - 12:24 PM

1) 2x+8y=20 y=2 2x+8(2)=20 2) x=5 2x+y=10 2(5)+y=10 3) 5x-2y=3 y=2x 5x-2(2x)=3 4) 2y+x=-15 x=3y 2y+(3x)=-15 5) 4x+7y=19 y=x+9 4x+7(x+9)=19 6)y=6x+11 2y-4x+14 2(6x+11)-4x+14 7)2x-8y=6 y=-7-x 2x-8(-7-x)=6 8) x=2y-1 3x-2y=-3 3(2y-1)-2y=-3 what is the process and what x and y equal

If they give you what one variable is, you can plug it into the equation and use algebra to solve it. So:

1)2x=4 -> 4/2 = 2 so x=2

2) y=0

3) x=3

4) 2y + (3*3y) = -15
11y=-15 
y = -15/11

5) 4x + 7x + 63 = 19
11x = -44
x = -4

ANSWERED AT 28/03/2020 - 12:21 PM


QUESTION POSTED AT 28/03/2020 - 12:21 PM

What is 3x+5x+2 factorised for yr 10 gcse


Factorising quadratic expressions

Multiply these brackets to remind yourself how to factorise.

( x + 2 ) ( x + 5 ) = x2 + 7x + 10( x + 2 ) ( x + 3 ) = x2 + 5x + 6( x - 3 ) ( x - 5 ) = x 2 - 8x + 15( x + 6 ) ( x - 5 ) = x2 + x - 30( x - 6 ) ( x + 5 ) = x2 - x - 30

ANSWERED AT 28/03/2020 - 12:20 PM


QUESTION POSTED AT 28/03/2020 - 12:20 PM