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
jeyben [28]
3 years ago
8

The ratio of girls to boys in class is 9 to 7 and there are 80 students in the class. how many girls are in the class?

Mathematics
1 answer:
xxTIMURxx [149]3 years ago
3 0

Given that, the ratio of girls to boys in class is 9 to 7.

Let's assume there is 9x girls and 7x boys in the class.

There is total of 80 students which means sum of 9x and 7x must be equal to 80. So, we can set up an equation as following:

9x + 7x = 80

16x = 80 Combine the like terms.

\frac{16x}{16} =\frac{80}{16} Divide each sides by 16 to isolate x.

So, x = 5

Since there is 9x girls in the class. So, next step is to substitute x=5 in 9x to get the number of girls in the class. Therefore,

9x = 9(5) =45.

Hence, there is 45 girls in the class.

You might be interested in
The triangles are congruent. Write the<br><br>congruence statement (LT#4)
gogolik [260]

Answer:

C

Step-by-step explanation:

Look at the angle markings. Angle C has one mark, Angles E and S have two marks, and Angles D and R have three marks.

Therefore, these angles correspond with one another and determine the order of the letters.

8 0
3 years ago
Criminal investigators use biometric matching for fingerprint recognition, facial recognition, and iris recognition. When matchi
Daniel [21]

Answer:

Type I error.

Step-by-step explanation:

Let's remember the definition of Type I error and Type II error:

A type I error is the rejection of a true null hypothesis, this means that we would get a "false positive" with this error.

A type II error is the non rejection of a not true null hypothesis, this error would give us a "false negative".

In this problem, we are told that the mean match score to identify a suspect is 80. However, the test shows that the mean match score is more than 80 when the person doesn't have a fingerprint match (and therefore the person would not be a suspect). Therefore, this person would appear as a suspect when he/she really isn't one. This means that the test is giving a "false positive". Thus, this is a type I error.

6 0
3 years ago
Bronson builds a rectangular deck for his friend. the width of the deck is 29 feet. the perimeter of the deck must be at least 1
olga_2 [115]
<span>Answer: a) Greater than or equal to 38 feet b)Since there is no restriction on the perimeter there exists many possible values for the length of the deck. Explanation: Given that the width of the deck is 29 ft. and the perimeter of the deck is at least 134 ft. 134 = 2(length + width) 134 = (2 x length) + (2 x 29) 134 = (2 x length) + 58 2 x length = 134 - 58 2 x length = 76 length = 76 / 2 length = 38 ft Thus, the inequality will be: a)Length ≥ 38 ft b)since there is no restriction on the perimeter there exists many possible values for length of deck.</span>
4 0
3 years ago
On average, there are 3 pages in every chapter of a James Patterson novel. Each book has approximately 79 chapters. James Patter
sdas [7]

Answer:13746

Step-by-step explanation:

3 * 79 = find amount of pages on average per book

= 237


237 * 58 = find amount of pages written for 58 books

=13746


James Patterson has written approximately 13,746 pages

6 0
3 years ago
Lin solved the equation
Alekssandra [29.7K]

Answer: x=1/2

she was wrong, it's supposed to be

Step-by-step explanation: 8(x−3)+7=2x(4−17)

Step 1: Simplify both sides of the equation.

8(x−3)+7=2x(4−17)

(8)(x)+(8)(−3)+7=2x(4−17)(Distribute)

8x+−24+7=−26x

(8x)+(−24+7)=−26x(Combine Like Terms)

8x+−17=−26x

8x−17=−26x

Step 2: Add 26x to both sides.

8x−17+26x=−26x+26x

34x−17=0

Step 3: Add 17 to both sides.

34x−17+17=0+17

34x=17

Step 4: Divide both sides by 34.

34x/34=17/34 x=1/2

3 0
3 years ago
Other questions:
  • Follow these instructions to make your own triangle?
    9·1 answer
  • a jar of cookies contains 18 different types of cookies. Each type is equally likely to be chosen. Based on your simulation, how
    7·1 answer
  • MO bisects angle LMN , angle LMO = 6x-22 and angle NMO = 2x +34. Solve for x and find angle LMN.
    14·1 answer
  • Aarons wrestling coach played him in the highest weight class all the wrestlers and the weight class away at least 115 lb if w s
    5·1 answer
  • Which line segments are equal? How do you know?
    6·1 answer
  • An adult elephant that is 10 ft tall casts a shadow that is 15 ft long. Find the length of the shadow that is a 8 ft telephone b
    8·1 answer
  • -5 1/2 + 6 3/4 + (-4 1/4) =
    5·2 answers
  • What is L x W X H mean
    9·2 answers
  • Will mark brainliest
    7·2 answers
  • If A and B are supplementary angles and A is four times as large as ​B, find the measures of A and B.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!