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]
3 years ago
5

Lucy wants to be exempt from her semester exam. In order for that to happen, she has to average an 85 over 3 test grades. Her fi

rst 2 test grades were 81 and 86. What does Lucy need to make on her third test in order to have an exact average of 85 and be exempt from her exam?
Mathematics
1 answer:
anastassius [24]3 years ago
8 0

Answer:

<em>Grades to be scored in 3rd exam = 88</em>

Step-by-step explanation:

Given that average of 3 numbers is 85.

First two numbers are 81 and 86.

To find:

3rd number so that average is 85

Solution:

Let the third number = x

Formula for average is:

Average = \dfrac{Sum\ of\ numbers}{Total\ count\ of\ numbers}

Here, sum of numbers = 81+86+x =167+x

Total count of numbers = 3

85 = \dfrac{167+x}{3}\\\Rightarrow x=255-167\\\Rightarrow \bold{x=88}

<em>Grades to be scored in 3rd exam = 88</em>

You might be interested in
The table shows the numbers of students at a high school who take Spanish or Chinese. No students take both languages. What
omeli [17]

Answer: Boutta snitch on you. CHHS 10th grade

Step-by-step explanation:

4 0
3 years ago
4567 divided by 13 please <br> help
katrin2010 [14]
351.3 you can use calculators you know lol
6 0
3 years ago
Mr. Ahmed has 9 water heaters for his apartment buildings. each heater weighs 32 kilograms. How many grams do all 9 water heater
iris [78.8K]
Multiply 32X 9 = 288kg

they asked you to convert the kilograms to grams so divide the 288kg by a 1000= 0.288grams 

8 0
3 years ago
3 -1 ___ 1/4 a.= b.&lt; c.&gt;
Alex Ar [27]
The answer to this is question is C
5 0
3 years ago
Graph the image of M(<br> –<br> 9,1) after a rotation 270° counterclockwise around the origin.
Masja [62]
The points of (9,1) after a 270 degree counterclockwise rotation would be (1,-9)
Hope this helps!
3 0
3 years ago
Other questions:
  • What is the mean of the prices below?
    15·2 answers
  • Let f(x) = x2 - 8x 5. Find f(-1).
    8·2 answers
  • Before soccer practice, Laura warms up by jogging around the outside of the entire soccer field. Measures 80meters by 120meters
    8·1 answer
  • CAN YOU GUYS PLEASE ANSWER THE QUESTION RIGHT FOR ONCE
    12·2 answers
  • Joe can cut and split a cord of firewood in 3 fewer hours than Dwight can. When they work​ together, it takes them 2 hours. How
    8·1 answer
  • Gareth has $2,000 to invest. Putting the money in a savings account at his local bank will earn him 2.2% annual interest and giv
    12·2 answers
  • Please, someone, help me
    5·1 answer
  • SOMEONE PLEASE HELP ME<br><br> Geometry <br> Lesson 1.1 Practice
    9·2 answers
  • What is the main function of the peripheral nervous system?
    7·2 answers
  • Find slope for 3y=-4x+6 please help asap :)
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!