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
gulaghasi [49]
3 years ago
13

After reading 80% of her emails in her inbox, Danette still has M unread emails.

Mathematics
2 answers:
AlexFokin [52]3 years ago
5 0

Answer:

\frac{M}{1-0.8} and 5M

Step-by-step explanation:

1. Let's imagine that you have 100 e-mails unread. When you read 80% of these e-mails you have the following amount M unread:

100-(0.8)(100)=20 e-mails

2. If you substitute 20 e-mails into the equations shown above, you will obtain the original amount:

\frac{20}{1-0.8}=100\\5(20)=100


Tomtit [17]3 years ago
4 0

answer :  option A  and B

After reading 80% of her emails in her inbox, Danette still has M unread emails

M unread emails

Let x be the number of emails before reading

80% of emails are left in the box. So, 0.08x  emails are left in the box

Now we make an equation

number of emails - 80% of unread emails= number of unread mails

x  - 0.08x = M

Now we factor out x

x ( 1- 0.08) = M

So x = \frac{M}{1-0.8}

or x = \frac{M}{0.2}= 5M


You might be interested in
A polygon has its vertices at the following points.
seropon [69]

Answer:

isosceles trapezoid

Step-by-step explanation:

1) find the distance of the points

\sqrt{(x2-x1)^2 + (y2 -y1)^2}

AB = \sqrt{(4-2)^2 + (7-5)^2} = \sqrt{4 + 4} = \sqrt{8} = 2 \sqrt{2}

BC = |7-4| = 3

CD = \sqrt{(9-7)^2 + (5-7)^2}= \sqrt{4+4} = \sqrt{8} = 2 \sqrt{2}

AD = |9-2| = 7

2) equation of the line that passes threw BC

y = 7

3) equation of the line that passes threw AD

y = 5

conclusion

the quadrilateral has two parallel sides and two congruent sides, so it is a isosceles trapezoid

3 0
2 years ago
What two forms can you write for 0.632
Dennis_Churaev [7]
0.632

=632/1000

=316/500
8 0
3 years ago
Question 2.what is the probability that between 80 and 115 complaints are received in one week? use a n(110,20) model to approxi
AURORKA [14]

Calculate standard  Z values for the given data:-

z = (80 - 110) / 20 = - 3/2 = -1.5

and z = (115 - 110) / 20 =  0.25

so we need  Prob ( -1.5 < z < 0.25)

Using standard tables this  comes to 0.5319  Answer


6 0
3 years ago
Which expression is equivalent to b^-3/ab^-3?
Mrrafil [7]
1/a

The b^-3 in the denominator and numerator cancel out
7 0
3 years ago
How many dominos are needed to complete the triangle?
solong [7]

Only 3 is needed

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Other questions:
  • PLZZZZZ NEED HELP!!!!!!
    8·1 answer
  • Rewrite the system of linear equations as a matrix equation AX = B.
    5·1 answer
  • How is finding the factors of a number different from finding the prime factorization of a number
    14·2 answers
  • Triangle L M Q is cut by perpendicular bisector L N. Angle N L Q is 32 degrees and angle L M N is 58 degrees.
    7·1 answer
  • What is the equation of the line perpendicular to 2x+5y=202x+5y=20 and containing the point (10,−4)(10,−4)?
    9·1 answer
  • Does the equator cross the northen or southern part of south america south america is mostly located
    9·2 answers
  • Find an equation for the linear function which has slope -10 and x-intercept -7
    15·1 answer
  • The measure of a vertex angle of an isosceles triangle is 58 degrees. What is a measure each base angle?
    15·1 answer
  • A rectangle measures 12cm by 4cm.<br> What is its area?
    14·1 answer
  • Hi, help ASAP please.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!