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
natka813 [3]
3 years ago
11

sally and martha had the same number postcards. after sally sold 18 of her postcards, martha had 4 times as many postcards as sa

lly. how many postcards did each girl have to begin with?
Mathematics
1 answer:
Lyrx [107]3 years ago
8 0
18 times 4 = 72 Both started with 72 Martha sold more
You might be interested in
Write 2 1/16 as decimal <br> (that is not a 21)
Lapatulllka [165]

2 1/16 = 2 + 1/16

11/16 = 0.0625

So

2 + 0.0625 = 2.0625

Answer

2.0625


5 0
3 years ago
Need help factoring this expression
Sindrei [870]

3x+9

3 is a factor of both 3 and 9

3(x+3)

5 0
3 years ago
Read 2 more answers
An author published a book which was being sold online. The first month the author sold 21000 books, but the sales were declinin
Wittaler [7]

Answer:  119,616

You may have to erase the comma when inputting the answer.

=======================================================

Explanation:

The author sells 21,000 books in the first month.

Then they sell 21,000*(1-0.12) = 21,000*(0.88) = 18,480 in the second month.

Then they sell 18,480*(1-0.12) = 18,480*(0.88) = 16,262.4 = 16,262 in the third month.

And so on. These values follow a geometric sequence with first term a = 21,000 and common ratio r = 0.88

We can think of the 0.88 as 88% of the original value (since losing 12%, we keep the remaining 88%)

-------------

Use the formula below to sum the first 9 terms of the geometric sequence

Plug in a = 21000 and r = 0.88

S_n = a*\frac{1-r^n}{1-r}\\\\S_9 = 21000*\frac{1-0.88^9}{1-0.88}\\\\S_9 \approx 21000*\frac{0.6835216}{0.12}\\\\S_9 \approx 21000*5.6960133\\\\S_9 \approx 119,616.2793\\\\S_9 \approx 119,616\\\\

The author sold about 119,616 books over the course of the first nine months.

4 0
3 years ago
What is seven over twenty one take away one over twenty one in its simplest form
natulia [17]
It would be 6/21 but simplified it would be 2/7
5 0
3 years ago
Solve for the indicated variable.<br><br> y = mx + b for x<br><br> x=
kogti [31]

Answer:

y-b/m = x

Step-by-step explanation:

y = mx + b

~Subtract b to both sides

y - b = mx

~Divide m to both sides

y-b/m = x

Best of Luck!

3 0
3 years ago
Other questions:
  • If you earn a commission of $150.00 per course that you sell on the internet, and you have sold 112 courses, what is your commis
    9·2 answers
  • If I clock in at 818 and take a 30 minute lunch what time can i clock out and have 8 hours worked​
    15·1 answer
  • Let f(x) be a 5th degree polynomial. If 4, 2 + 3i, and −5i are zeros of f(x), list all other zeros.
    13·1 answer
  • If the perimeter of the square below is 12x^2-8x-4, what is the area of the figure
    6·1 answer
  • Graph the inequality <br> y&gt;-4x+1
    5·1 answer
  • Its eitheir a or c b and d dont check out what is it image down below
    6·2 answers
  • what is the likelihood of choosing a blue marble from a bag containing 8 red, 6 yellow, 12 green, and 6 blue marbles​
    8·2 answers
  • Solve for x. Round answer to the nearest tenth.<br> 17<br> 54°<br> х
    12·1 answer
  • its 0 degrees outside at midnight the temperature of the air drops 20° in the morning hours then gains 3° as soon as the sun com
    5·1 answer
  • How much time will it take for an amount of Rs900 to yield Rs81 as interest at 4.5% per annum of simple interest
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!