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
svp [43]
3 years ago
11

When Sandy and Allen's mother decorates the house for a holiday by herself, it takes her 5 hours. When both Sandy and Allen help

, the three can finish the job in 2.5 hours. When only Allen helps his mother decorate, it takes the two 3.5 hours. How long would it take Sandy to decorate the house by herself?
Mathematics
2 answers:
Reil [10]3 years ago
7 0

Answer:

5 hours

Step-by-step explanation:

saveliy_v [14]3 years ago
5 0

Answer:

8 3/4

Step-by-step explanation:

time for all work:

Mother - 5 hours

Mother + Sandy + Allen - 2.5 hours

Mother + Allen - 3.5 hours

Sandy - x

In 1 hour

Mother - 1/5

Mother + Sandy + Allen - 2/5

Mother + Allen - 2/7

Sandy - 1/x

(M+S+A) - S = (M+A)

2/5 - 1/x = 2/7

solve equation

x = 8 3/4 hours

Hope this helps :)

You might be interested in
You have 5 bikes. Altogether it costs 789$ how much does each bike cost?​
algol [13]

Answer:

$157.80

Step-by-step explanation:

$789 / 5 bikes

5 0
3 years ago
Read 2 more answers
A contractor is required by a county planning department to submit one, two, three, four, five, or six forms (depending on the n
Ratling [72]

Answer:

a)

k = \dfrac{1}{21}

b) 0.476

c) 0.667    

Step-by-step explanation:

We are given the following in the question:

Y = the number of forms required of the next applicant.

Y: 1, 2, 3, 4, 5, 6

The probability is given by:

P(y) = ky

a) Property of discrete probability distribution:

\displaystyle\sum P(y_i) = 1\\\\\Rightarrow k(1+2+3+4+5+6) = 1\\\\\Rightarrow k(21) = 1\\\\\Rightarrow k = \dfrac{1}{21}

b) at most four forms are required

P(y \leq 4) = \displaystyle\sum^{y=4}_{y=1}P(y_i)\\\\P(y \leq 4) = \dfrac{1}{21}(1+2+3+4) = \dfrac{10}{21} = 0.476

c) probability that between two and five forms (inclusive) are required

P(2\leq y \leq 5) = \displaystyle\sum^{y=5}_{y=2}P(y_i)\\\\P(2\leq y \leq 5) = \dfrac{1}{21}(2+3+4+5) = \dfrac{14}{21} = 0.667

8 0
3 years ago
Another representation, in polar coordinates, of the point (3, 5pi/4) is ( ___, pi/4)
VladimirAG [237]
The answer is (-3, pi/4). I just took the quiz
3 0
3 years ago
Read 2 more answers
The Sea Wharf Restaurant would like to determine the best way to allocate a monthly advertising budget of $1000 between newspape
Sati [7]

Answer:

Step-by-step explanation:

to find the answer you will want to gather the indenpent varible and dependent varrible. SO when you look at the problem you see 25%. You have to find the amount of money on each thing they bought. The budget and how much  they have to spend.

4 0
3 years ago
T is the midpoint of rq if r=12 t=-3 what is q
Gemiola [76]
Well how far away is t (-3) from r (12)?
It's 15 away. It gets 15 less, so q will be 15 more.
12+15=27
q is 27
5 0
3 years ago
Other questions:
  • Triangle XYZ is translated 4 units up and 3 units left to yield ΔX′Y′Z′. What is the distance between any two corresponding poin
    13·1 answer
  • (01.01 LC)A dancer took forward and backward steps of equal length during a dance. After taking 16 steps total, she was back at
    12·2 answers
  • Write an algebraic expression, 1 less than the quotient of a number n and 6
    15·2 answers
  • 3a
    14·1 answer
  • Tirzah wants to put a fence around her garden. She has 22 yards of fence material. Does she have enough to go all the way around
    8·1 answer
  • Graph a function and it's inverse f(x) =x^2 -1​
    7·1 answer
  • What is an equation of the line that passes through (2,2) and is parellel to the line y=7x
    6·1 answer
  • On the last math test in Kenzie’s class, 17 out of 25 students scored an 80 or higher. Which percent is closest to the experimen
    10·1 answer
  • Consider the function ƒ(x) = (x + 1)2 – 1. Which of the following functions stretches ƒ(x) vertically by a factor of 4?
    9·1 answer
  • A 2003 survey showed that 14 out of 250 Americans surveyed had suffered some kind of identity theft in the past 12 months. What
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!