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kati45 [8]
3 years ago
12

Bobbi can mow the park in 3 hours and Deshaun can do the same job in 7 hours. How long will it take them to mow the park

Mathematics
1 answer:
Bogdan [553]3 years ago
7 0

Answer:

2.1 hours (2 hours and 6 minutes)

Step-by-step explanation:

The rate of work of Bobbi is ⅓ while for Deshaun is 1/7 hence combined rate will be

⅓+1/7=(7+3)/21=10/21

The equivalent hours is the reciprocal of the above hence 1021/10=2.1 hours

0.1 of an hour is equivalent to 0.1*60=6 minutes

Therefore, the efforts combined will take 2.1 hours or 2 hours and 6 minutes

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mixer [17]

Answer:

11.5 for first question

4 0
2 years ago
Pediatricians work an average of 48 h per week. The standard deviation is 12 hours. What percentage of pediatricians work more t
cricket20 [7]

Answer: 2.28 %

Step-by-step explanation:

Given : Mean : \mu=\ 48

Standard deviation :\sigma= 12

The formula to calculate the z-score :-

z=\dfrac{x-\mu}{\sigma}

For x = 72

z=\dfrac{72-48}{12}=2

The p-value = P(2

1-0.9772498=0.0227502\approx0.0228

In percent, 0.0228\times100=2.28\%

Hence, the  percentage of pediatricians work more than 72 h per​ week = 2.28 %

4 0
3 years ago
Triangle ABC has vertices at A(3, 8) , B(11, 8) , and C(9, 12) . Triangle FGH has vertices at F(1, 3) , G(9, 3) , and H(7, 7) .
Alex17521 [72]
Hmm, (x,y)
x is horizontal or left right
y is vertical or up down


so

we see that A to F is move left 2 and down 5
B to G is left 2 and down 5
C to H is left 2 and down 5


so translatete ABC left 2 and down 5 and
translate FGH right 2 and up 5

not 1st option
2nd works
3rd works
4th is false


2nd and 3rd
6 0
3 years ago
Read 2 more answers
find the area of the bedroom with the shape shown in the figure, in square feet 12 ft 14 ft 7 ft 34 ft
katrin [286]

Answer: See Explanation

Step-by-step Explanation: The L shaped figure, ignoring the track-like image inside, is the same as the rectangle with just the 4 x 10 section removed.

4 0
1 year ago
Factorise this expression as fully as possible 2x^2+6x
AURORKA [14]

Answer:

(Factor out 2x from the expression)

2x (x +3)

3 0
3 years ago
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