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3 years ago

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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What is a surface area of the cuboid with 4,5 and 9

Anettt [7]

Answer:

SA = 202

Step-by-step explanation:

Surface area = Sum of all 6 areas of each side of the cuboid

SA = 2 (4·5 + 5·9 +9·4), because there are 2 of each kind of sides

SA = 2 (20+ 45 + 36)

SA = 2·101

SA = 202

8 0

2 years ago

Wasted Water A faucet leaks 1 oz of water per minute. a) How many gallons of water are wasted in a year? (A gallon contains 128

dimaraw [331]

Answer:

a) 4106.25 gallons

b) $46

Step-by-step explanation:

We are given the following in the question:

Leakage rate of faucet = 1 oz per minute

Cost of water = $11.20 per 1000 gallons

1 gallon = 128 oz

a) water are wasted in a year

1 hour = 60 minutes

1 day = 24 hours

1 year = 365 days

$1\text{ year} = 365\times 24\times 60\text{ minutes}\\1\text{ year} = 525600\text{ minutes}$

Amount of water wasted =

$\text{Leakage rate}\times \text{Time}\\=1 \times 525600\\=525600\text{ oz}\\\\=\dfrac{525600}{128}\\\\=4106.25\text{ gallons}$

Thus, 4106.25 gallons of water is wasted every year.

b) additional money spent

$=\time{Cost}\times \text{Amount of water wasted}\\\\= \dfrac{11.20}{1000}\times 4106.25\\\\=45.99\$ \approx 46\$$

Thus, approximately $46 is the additional money spent on water bill.

4 0

3 years ago

BRAINLIEST!! Pleaseee help me this is urgent

mojhsa [17]

Answer:

190 195

------- = -------

50 z

Solve for z:

1. Cross multiply

190z = (50)(195)

190z / 190 = 9750 / 190

z ≈ 51.3

5 0

3 years ago

Can u pls help me with this question

Tresset [83]

The answer is a b c e

3 0

3 years ago

Translate the phrase "in 3 years" into algebraic terms

Semenov [28]

Answer:

In three years can be into algebraic terms as: 3 + x. Where 'x' comes to be today's age.

For example, my age in three years will be:

If I'm 24 years right now, My age in three years = 3 + x ⇒ My age in three years = 3 + 24 = 27.

3 0

3 years ago