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
Dahasolnce [82]
3 years ago
5

Plz help its due TOMMOROW​

Mathematics
1 answer:
sashaice [31]3 years ago
4 0

Answer:

  86%

Step-by-step explanation:

Let g represent the mean mark for the 10 girls in the class. Then the mean mark for the class was ...

  10g +20(62%) = 30(70%)

  g = 3(.7) -2(.62) . . . . . . . . . divide by 10 and subtract 2(.62)

  g = .86 = 86%

The mean mark for girls was 86%.

_____

You can do this in your head if you consider it in terms of deviations from the mean. The second equation above can be rewritten and factored as ...

  g = 70% +2(70% -62%)

That is, because there are 2 boys for every girl, the girl's score is above the mean by an amount that is 2 times the amount that the boy's score is below the mean. The boys' score is below by 8%, so the girls' score is above by 16%, so is 86%.

You might be interested in
Answer asap ~~~~~~~~~~~~~~~~~~~~~V~~~~~~~~~~~~~~~~`
andriy [413]

6 units

12 is also a diameter because it goes through the whole circle.

Divide it by 2 to find 6.

6 0
3 years ago
Read 2 more answers
Of the 145 students who took a mathematics exam, 80 correctly answered the first question, 81 correctly answered the second ques
jasenka [17]

Answer: 64

Step-by-step explanation:

the Kids that answered correct in any of questions 1 and 2 got at least one right so subtract the highest number which is 81 students by all the general amount of them, 145 that’s 64.

3 0
3 years ago
½ of the length of rope A is equal to 3/5 of the length of rope B. Rope A is 42cm longer than rope B. How long is rope A? ​
icang [17]

Answer: A = x^2/16 + (5 - x/4)^2 > 20.5

Hope this helped.

5 0
3 years ago
It is 42 1/2 miles from Eaton to Baxter and 37 4/5 miles from Baxter to Wellington. How far is it from Eaton to Wellington if yo
34kurt
All you need to do is add the miles from Eaton to Baxter and from Baxter to Wellington to get your answer...

42 + 37 = 79 

Now we need to add the fractions 

\frac{1}{2} +  \frac{4}{5} = ...


To add we need a common denominator. 
2 and 5 can both go into 10, so that will be a our common denominator. 
Now you have... 
\frac{5}{10} + \frac{8}{10} = \frac{14}{10}
which is equal to 1 \frac{2}{5}
add that to the 79 we got earlier ...

The toal and final answer is 80 \frac{2}{5} miles !
Hope I helped and remember to vote this as the brainliest answer ! :)
4 0
4 years ago
Subtract.<br> -3 - (-1) = 1
Margarita [4]

Answer:

the answer is -2

Step-by-step explanation:

3-(-1)

= -3--1

= -3+1

= -2

6 0
4 years ago
Other questions:
  • Please someone help me please​
    8·1 answer
  • Can someone please answer. There is one problem. There's a picture. Thank you!
    11·1 answer
  • Which of the following expressions has the greatest value? A. 62 O B. 53 O c. 52 O D. 32​
    13·1 answer
  • Combine like terms <br> 9j+34j
    12·2 answers
  • I need help on math please
    10·2 answers
  • 7 calculators cost £81.90.<br> How much do 11 calculators cost?
    10·2 answers
  • Please help quickly I will give you brainiest But please don't make me report you
    13·2 answers
  • What are the minimum and maximum distances that Morgan’s dog may be from the house? (Algebra ll) *URGENT*
    9·1 answer
  • What is the width of a rectangle that has an area of 96 square inches and a length of 12 inches?
    13·2 answers
  • If marco buys a shirt for $45.20 and has a discount of 30% what is the new price of the shirt?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!