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
Helpppp meeee question 1 pleaseee !!!
love history [14]

Answer:

2     0     -2      -4

Step-by-step explanation:

pls give brainliest

4 0
3 years ago
Read 2 more answers
The ratio of black marbles to red marbles is 3:2. If there are a total of 25 marbles in a bag,
kumpel [21]

Answer:

15 black marbles

Step-by-step explanation:

So its. A ratio (basically a fraction)

3/2

we add them up so we know how much marbles but not which kind

so we get 5

now we know for every 5 batches there is 3 black and 2 red

so we divide 25/5 to get 5

now we know there are 5, 5 batches of black ad red marbles.

now black is 3 of them so we multiply 5(3) which is 15

Now red is 2 of them so we multiply 5(2). Which is 10

now to check, if we add them up, they equal to 25 which is correct.

basically add the fraction, divide that by the original number, time the quotient by each number in the fraction.

8 0
3 years ago
Read 2 more answers
Identify each pair of angles as corresponding, alternate interior, alternate exterior, or consecutive interior.
zhuklara [117]

Answer:

1. The answer for this question is corresponding angles.

2. The answer for this question is alternate interior

6 0
3 years ago
He cost, in millions of dollars, of building a three-story high school in new york state was estimated to be c(x) = 2.1 + 0.12x
ratelena [41]

Given cost function is

c(x) = 2.1 + 0.12x - 0.0001x^2 (20 ≤ x ≤ 400)

where x is the number of thousands of square feet

total revenue will be $0.2 million dollars per thousand square feet

Revenue is 0.2 millions per thousand square feet. we know x is the number of thousand of square feet

So R(x) = 0.2x

We know Profit = Revenue - Cost

P(x) = R(x) - C(x)

P(x) = 0.2x - (2.1 + 0.12x - 0.0001x^2)

P(x) = 0.2x - 2.1 - 0.12x + 0.0001x^2)

combine like terms

P(x) =-2.1 + 0.08x + 0.0001x^2

Profit function is

P(x) =0.0001x^2 + 0.08x - 2.1


5 0
3 years ago
66x + 8= 20x -15<br> Solve
tensa zangetsu [6.8K]

66x + 8 = 20x - 15

66x - 20x = -15 - 8

46x = -23

x = -23/46

x = -1/2

<h3>#CMIIW</h3>

7 0
3 years ago
Other questions:
  • What is the domain of the following list of ordered pairs?<br> (-3, -2), (1, 5), (-2, 4)
    15·1 answer
  • Please help. will mark brainliest
    15·1 answer
  • Find the exact value of <br> sin−1−32
    10·1 answer
  • Jim has a swimming pool that needs to be drained. His pool holds 9,926.5 gallons of water and will be completely drained in 6 ho
    13·1 answer
  • Please help! (Will give brainliest answer and hearts) Thank you and have a nice day!
    9·1 answer
  • I need all the answers
    5·1 answer
  • Please help!!! Been stuck here for quite awhile.
    9·1 answer
  • Are the two triangles congruent ? Please answer correctly !!!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!
    10·2 answers
  • Help with math please giving lots of points!
    12·1 answer
  • Harry bought the items shown below. laptop $2000.00 watch $500.00 He received a 1/10 discount off the total cost. Calculate the
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!