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
Andru [333]
4 years ago
15

Sally can paint a room in 7 hours while it takes Steve 6 hours to paint the same room. How long would it take them to paint the

room if they worked together.
Mathematics
1 answer:
mash [69]4 years ago
5 0
Sally paints at a rate of 1/7th room / hour

Steve paints at a rate of 1/6th room / hour

If they both painted together, they would paint 1/7 + 1/6 = 13/42 room/hour

so to paint the whole room, it would take 1/(13/42) = 42/13 =
<u>
3.23 hours (3 significant figures)</u>
You might be interested in
Which is true or flase<br> 0.02 is 10 times 0.2.
GREYUIT [131]
0.2 × 10
Move the decimal point one place to the right and you will get 2, NOT 0.02.
Therefore this statement is <em>false</em>.
3 0
3 years ago
Which conclusion of the following statement must always be true?
erica [24]

Answer:

4th answer

Step-by-step explanation:

angle 1 is congruent to angle 2, they stay the same..... as are corresponding angles that also appear when parallel lines are cut by a transversal .

4 0
3 years ago
A regulation softball has a circumference of 12 inches. what is the volume of the softball?
frez [133]
V=(4/3)pir^2

c=2pir
12=2pir
divide 2
6=pir
divide by pi
6/pi=r

sub for r
V=(4/3)pi(6/pi)^2
V=(4/3)pi(36/(pi^2))
V=(4/3)(36/pi)
V=144/(3pi)
V=48/pi
aprox pi=3.141592
V=15.2788777155

V=15.28 in^3
8 0
3 years ago
The probability that a lab specimen contains high levels of contamination is 0.12. A group of 4 independent samples are checked.
sergiy2304 [10]

Answer:

0.5996 is the probability that none contain high levels of contamination.

Step-by-step explanation:

We are given the following information:

We treat  lab specimen containing high levels of contamination as a success.

P( lab specimen containing high levels of contamination) = 0.12

Then the number of lab specimens follows a binomial distribution, where

P(X=x) = \binom{n}{x}.p^x.(1-p)^{n-x}

where n is the total number of observations, x is the number of success, p is the probability of success.

Now, we are given n = 4

We have to find the probability that none of the lab specimen consist of high level of contamination.

We have to evaluate:

P(x = 0)\\= \binom{4}{0}(0.12)^0(1-0.12)^{(4-0)}\\= 0.5996

0.5996 is the probability that none contain high levels of contamination.

5 0
4 years ago
Help me please i need it
xz_007 [3.2K]

Answer:

$300

Step-by-step explanation:

Money that she earns per hour:

$180÷18=$10

30 hours:

30×$10=$300

5 0
3 years ago
Read 2 more answers
Other questions:
  • Ahoy there, matey! Our pirate ship had 5/6 of a treasure chest full of gold. Then we plundered an enemy ship and took their 3/8
    15·2 answers
  • Please help me with this question
    15·1 answer
  • The figure is made up of two shapes, a semicircle and a rectangle.
    9·2 answers
  • Y=-6x+4<br> Y=-2<br> What is the solution?
    6·1 answer
  • richard spends 1/8 of his money on fruits 1/2 on vegetables and saves the rest.what fraction of his money did he save?​
    6·1 answer
  • Reagan’s piggy bank has all nickels ($.05) and dimes ($.10). The value of the money in his piggy bank is $7.80. Reagan has 66 ni
    14·1 answer
  • Wich of the following is a TRUE statement about the system of equations graphed below?
    10·2 answers
  • Cheyenne is deciding between the ways she has to buy music. Albums on CD cost
    14·1 answer
  • A recipe uses 4 cups of milk to make 20 servings. If the same amount of milk is used for each serving, how many servings can be
    13·1 answer
  • What is the peremeter and area of the photo below, also please show work .
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!