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Georgia [21]
4 years ago
7

One gardener can mow a golf course in 4 hours, while another gardener can mow the same golf course in 6 hours. How long would it

take if the two gardeners worked together to mow the golf course?
Mathematics
1 answer:
Anastasy [175]4 years ago
5 0

Answer:

2 hours and 24 minutes

Step-by-step explanation:

1/4 +1/6=1/t

12t(1/4+1/6)=12t(1/t)

3t+2t=12

t=2.4 hours or 2 hours and 24 minutes

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andre [41]

1 4 is 1 away from 5 5 is one away from 6 and It just goes on

7 0
3 years ago
Assume that when adults with smartphones are randomly​ selected, 61% use them in meetings or classes. If 8 adult smartphone user
podryga [215]

Answer:

0.1147

Step-by-step explanation:

When adults with smartphones are randomly​ selected, 61% use them in meetings or classes, then

  • the probability of using the smartphone is p=0.61;
  • the probability of not using the smartphone is q=1-p=1-0.61=0.39.

If 8 adult smartphone users are randomly​ selected, the probability that exactly 3 of them use their smartphones in meetings or classes can be calculated using binomial distribution as

C^8_3\cdot p^3\cdot q^{8-3}=C^8_3\cdot (0.61)^3\cdot (0.39)^5

Note that

C^8_3=\dfrac{8!}{3!(8-3)!}=\dfrac{5!\cdot 6\cdot 7\cdot 8}{2\cdot 3\cdot 5!}=\dfrac{6\cdot 7\cdot 8}{2\cdot 3}=7\cdot 8=56,

then the probabilty is

56\cdot (0.61)^3\cdot (0.39)^5\approx 0.1147

8 0
3 years ago
What is real numbers? explain briefly..​
svetoff [14.1K]

Answer:

a quantity that can be expressed as an infinite decimal expansion is real number.This includes all integers and all rational and irrational numbers.It can be either positive or negative.it can be either rational and irrational but not both It is demoted by R .Then numbers which are not both rational and irrational are not real numbers.

plz mark me as brainliest

7 0
3 years ago
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Westkost [7]
To find the sales tax you’d need to find 9% of 87. You find this by using this template, x%/100%=y/z, x being the sales tax, y being 9% in cash, and z being the 87 dollars. You multiply the x value by the z value, (9 X 87=783) and then divide that product by 100%. This gives you the sales tax of 7.83, and when you add that to 87 you get $94.83. Subtract that from the 5 20 dollar bills ($100) and you are left with $5.27 change.
4 0
3 years ago
HURRY. Write a ratio for the following word phrase. Write the fraction in lowest terms.
mestny [16]

Answer:

84:2 42/1

Step-by-step explanation:

i think

hope ths helps

8 0
3 years ago
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