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Marizza181 [45]
3 years ago
10

Working alone, Natalie can clean an attic in 9 hours. Lea can clean the same attic in 8 hours. How long would it take them if th

ey worked together?
Work it out please!!!
A) 5.47 hours
B)3.78 hours
C)4.74 hours
D)4.24 hours
Mathematics
1 answer:
professor190 [17]3 years ago
3 0
(1 attic / 8 hrs) + (1 attic / 9 hrs) = (1 attic / t hrs)

1/8 + 1/9 = 1/t
find common denominator
9/72 + 8/72 = 1/t
17/72 = 1/t
flip or cross multiply
72/17 = t
4.24 hrs = t
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Enter a range of values of x
igomit [66]

Answer:

-5.

Step-by-step explanation:

We know that if two corresponding sides of two triangles are equal, then third sides of the triangles depend on angle between equal sides.

Angle opposite to larger side is larger.

Since, 14 < 15, therefore

2x+10

2x

2x

x          ...(1)

We know that, angle can not not negative.

2x+10>0

2x>-10

x>-5        ...(2)

From (1) and (2), we get

-5

Therefore, the range of values of x is -5.

4 0
2 years ago
Which of these numbers 3,4,18,111,123,340,345,456,555 are multiples of 33 but not 9?
LUCKY_DIMON [66]

Answer:

4 and 132

Step-by-step explanation:

4 x 33 = 132

the numbers 4 and 132 have nothing to do with 9, no matter what way you look at them

i hope this helps :)

4 0
3 years ago
Frank is lending $1,000 to Sarah for two years. Frank and Sarah agree that Frank should earn a real return of 4 percent per year
Montano1993 [528]

Answer:

nominal rate of interest is 31.7 %

Step-by-step explanation:

given data

payment = $1000

time = 2 year

rate = 4%

CPI = 100

CPI final yer = 127.7

to find out

nominal rate of interest

solution

we know nominal rate of interest formula that is

nominal rate of interest = real interest rate + inflation rate    .........1

so here inflation rate is express as

inflation rate = ( CPI final year - CPI )  / CPI  × 100    ...........2

put here value

inflation rate = ( 127.7 - 100 )  / 100  × 100

inflation rate is 27.7 %

so from equation 1

nominal rate of interest = real interest rate + inflation rate

nominal rate of interest = 4% + 27.7%

nominal rate of interest is 31.7 %

7 0
3 years ago
the jones family paid $150 to a painting contractor to stain their 12 ft by 15 ft deck. The smith family 16 ft by 20 ft. What pr
vitfil [10]
12ft x 15ft = 180ft divided $150 = 1.2(this is how much the fts cost)
16ft x 20ft = 320ft divided by 1.2 = $266.66
8 0
3 years ago
20x4=10 <br> 30x13=12<br> 10x12=3<br> 40x11=
PIT_PIT [208]

Answer:

440

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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