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
Rina8888 [55]
3 years ago
9

After reading 80\%80% of her e-mails in her inbox, Danette still has MM unread e-mails.

Mathematics
1 answer:
NARA [144]3 years ago
3 0

Answer:   <em>The correct options are.....</em>

<em>A)   \frac{M}{1-0.8}   and</em>

<em>B)   5M</em>

Step-by-step explanation:

Suppose, the number of e-mails Danette had in her inbox before she started reading was X.

Percentage of read emails is 80%, so the number of read emails = (\frac{80}{100}*X)=0.8X

<u>Thus, the number of unread emails</u> = X-0.8X=X(1-0.8), <u>which is given as</u> M.

So, the equation will be........

X(1-0.8)=M\\ \\ \Rightarrow X=\frac{M}{1-0.8} (Answer: 1) \\ \\ \Rightarrow X=\frac{M}{0.2}\\ \\ \Rightarrow X=(\frac{1}{0.2})M=5M (Answer: 2)

Thus, the expressions which could represent the number of e-mails Danette had in her inbox before she started reading are:  \frac{M}{1-0.8} or 5M

You might be interested in
X^2 = -8x - 7 Rewrite the equation by completing the square. What are the solutions?
gladu [14]

1) rewrite the equation by completing the square

(X+4)^2=9

2) what are the solution to the equation

Answer A= X=-4 plus and minus 3

6 0
3 years ago
Patricia purchased x meters of fencing. She originally intended to use all of the fencing to enclose a square region, but later
sergejj [24]

Answer:

  (y^2)/4 square meters

Step-by-step explanation:

For a perimeter length of x, the side of a square will be x/4 and its area will be (x/4)^2.

If one side of the square is shortened by y/2 and the adjacent side is lengthened by y/2, then the difference in side lengths will be y. The area of the resulting rectangle will be ...

  (x/4 -y/2)(x/4 +y/2) = (x/4)^2 -(y/2)^2

That is, the difference in area between the square and the rectangle is ...

  (x/4)^2 - ((x/4)^2 -(y/2)^2) = (y/2)^2 = y^2/4

The positive difference between the area of the square region and the area of the rectangular region is y^2/4 square meters.

5 0
3 years ago
Ryo accidentally ordered 240% as many eggs as his restaurant needed. What fraction of the number of eggs his restaurant needs di
Anarel [89]

Answer:

Ryo ordered \frac{12}{5} of the amount of eggs his restaurant needed

Step-by-step explanation:

Let's call z the number of eggs the restaurant needs

Ryo ordered 240% of the eggs he needed. Then Ryo ordered:

\frac{240}{100}z.

This fraction can be simplified by dividing by 10 in the numerator and denominator.

Then it is:

\frac{24}{10}

It can be further simplified by dividing by 2 in the numerator and denominator:

\frac{12}{5}z

Ryo ordered \frac{12}{5} of the amount of eggs his restaurant needed

6 0
3 years ago
PLEASE HELP!<br> solve for the unknown: (3x)^3=81^2x-5, 7^2x+1=49^3x-2,
Evgen [1.6K]

Answer:

this is my attempt, it might not be right, so please dont be mad if wrong

Step-by-step explanation:

27 * x^3 = 6561x-5 , 49x + 1 = 117649x-2

3 0
3 years ago
How do i complete the square for this equation ? x^2+ 8x+y^2-2y=64
liraira [26]
<span>Simplifying x2 + 8x + y2 + -2y = 64
 Reorder the terms: 8x + x2 + -2y + y2 = 64 Solving 8x + x2 + -2y + y2 = 64 Solving for variable 'x'.
 Reorder the terms: -64 + 8x + x2 + -2y + y2 = 64 + -64
  Combine like terms: 64 + -64 = 0 -64 + 8x + x2 + -2y + y2 = 0


 The solution to this equation could not be determined.</span>
4 0
3 years ago
Other questions:
  • A pump can fill a swimming pool in 8 hours. The pool also has a drain that can empty the pool in 10 hours. If someone turns on t
    6·1 answer
  • Which is an example of an operation
    9·1 answer
  • How much money should be deposited today in an account that earns 7% compounded semiannually so that it will accumulate to $12,0
    5·1 answer
  • Your multiplying patterns with decimals. what os 0.1×30 equal
    8·2 answers
  • V=1÷3a2h rewrite the equation for h​
    15·1 answer
  • Find the solutions to the equation −16t2+40t+5=10 using the quadratic formula.
    13·1 answer
  • Find the area of a cross section parallel to the base of a cylinder with a radius of 2.5 cm and a height of 12 cm
    11·1 answer
  • Fbgvd3e456truyjtr4rfvgbuhnjm,mjkio0bghtrvgftrsxdq
    14·1 answer
  • What is the measure of angle x? . Enter your answer in the box <br> X=​
    6·1 answer
  • Which expression is equivalent to 21\root(3)(15)-9\root(3)(15)
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!