1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Rudik [331]
2 years ago
9

Dan is watching The Birds in his backyard. Of the birds he watches, 9. Of them,or 45%, are sparrows. How many birds are in his b

ackyard?
Mathematics
1 answer:
ra1l [238]2 years ago
5 0

If 9 of the sparrows is 45% of the birds in the backyard, 9/x = 45/100.

Cross multiply to get 9 * 100 = 45x; simplified is 900 = 45x or 20.

This means that there are 20 birds in the backyard. You can check this by dividing 9/20 which equals 45%

You might be interested in
A children's pool contains 17,500 milliliters. How many liters are in the pool
LiRa [457]

Answer:

17.5 L

Step-by-step explanation:

There are 17.5 Liters in 17,500 ML.

Hope this helps!

Plz Mark Brainliest!

4 0
2 years ago
Read 2 more answers
For a camping trip, Jack is preparing water canteens. The canteens each hold 1/3 gallon of water.
loris [4]

Answer:

42 canteens

Step-by-step explanation:

1 gal = 3 canteens

14*3=42

8 0
2 years ago
Write a rule for the nth term of the arithmetic sequence:<br><br> a11= 50, d = 7
ivolga24 [154]

Answer:

Required rule for n^{th} is a_{n}=7n-27.

Step-by-step explanation:

Given that,

a_{11} = 50,\  \  d=7

From the question: we have to write the n^{th} term of Arithmetic sequence.

Arithmetic Sequence or Arithmetic progression (A.P) : It is a sequence which possess that difference between of two successive sequence is always constant.

                a_{1} ,a_{2},a_{3},a_{4}.....................a_{n-1},a_{n}

                                        where, a_{1} is the first term of A.P

                                                     d is the common difference.

                                                     a_{n} is the last term or general term.

The above sequence to be in A.P then their common difference should be equal.

          d=a_{2}-a_{1} =a_{3}-a_{2}=a_{4} -a_{3} ..........................a_{n}-a_{n-1}

Now, Formula of General Term is a_{n}=a+(n-1)d

So,                                                    a_{11}= a+(11-1)d\\        a_{11} = a+10d

 Substituting the value of   a_{11} = 50,\  \  d=7 we get,

                                                         50=a+10\times7\\50=a+70\\a=-20

Then General term (a_{n}) of given data is

                                                         a_{n}=-20+(n-1)7\\a_{n}=-20+7n-7\\a_{n}=7n-27

Therefore, Required rule for n^{th} is a_{n}=7n-27.

5 0
3 years ago
Rose writes down all of her math quiz scores. Her math scores are 98,78,84, and 96. What is the mean of her math quiz scores?
KATRIN_1 [288]

Answer:

89

Step-by-step explanation:

Hi, there to find the mean

you need add the numbers and count how many numbers are there and divide

In this case 98+78+84+96= 356

Now we will count

there are 4 numbers

\frac{356}{4}= 89

Your mean will be 89

If you ever have trouble with mean remember this

Mean\frac{SumofDataPoints}{NumberofDataPoints }

well it is supposed to be:

Sum of Data Points/Number of Data Points

4 0
2 years ago
Out of the 12 girls who tried out for the softball team, 10 will be chosen for the team. Find the number of different 10-person
olga nikolaevna [1]

Answer:

The answer is 66 ways .

Step-by-step explanation:

You have to use <u>Combination</u> because it says choosing 10 out of 12 as the position is not important :

12C10 = 66 ways of arrangements

8 0
3 years ago
Other questions:
  • What is x^3-x^2-8x+12 in factored form?
    11·1 answer
  • 3+-1/1/3 the first half is 3+-1 the second half is 1/3
    5·1 answer
  • Use the drop-down menus to complete the statements about factoring 14x2 + 6x – 7x – 3 by grouping.
    12·2 answers
  • What measurement that is equal to 20 liters
    15·2 answers
  • Need help i dont get it <br> So please help me
    15·1 answer
  • Evaluate for x=2 and y=3: x^2y^-3/x^-1y
    12·1 answer
  • A box with a square base and open top must have a volume of 97556 c m 3 cm3 . We wish to find the dimensions of the box that min
    12·1 answer
  • ILL GIVE BRAINLEST:))
    7·1 answer
  • The cooking instructions for roast chicken state that it needs
    14·1 answer
  • Can someone help with 1 11/15 divided by 1 4/9?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!