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3 years ago

A group of workers can plant 21 acres in 7 days. What is their rate in acres per day?

Mathematics

2 answers:

In-s [12.5K]3 years ago

7 0

Answer:

Step-by-step explanation:

21 acres divided by 7 days equals to 3 days

Each day they do 3 acres

3 acres * 7 days = 21 acres in a week

musickatia [10]3 years ago

5 0

Answer:

I think<u><em> 3 acers</em></u> in a day. if you need an explanation pls let me know :)

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A plane can fly 305 miles downwind in the same amount of time as it can travel 215 miles upwind. Find the velocity of the wind i

son4ous [18]

Answer:

We can compute this in 2 ways:

305 downwind - 260 still air = 45 mph wind velocity

260 still air - 215 downwind = 45 mph wind velocity

Step-by-step explanation:

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3 years ago

Does (-1, 2), (1, 1),( 1 -1), (2,1), (4,2) represent y as a function

Paha777 [63]

No. A function maps one input to exactly one output. The given relation maps 1 to both 1 and -1, as indicated by the pairs (1, 1) and (1, -1).

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3 years ago

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kondaur [170]

Answer:

675

Step-by-step explanation:

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3 years ago

Read 2 more answers

Divide. Write the quotient in lowest terms. 3 3/8 ÷ 9

Troyanec [42]

3 3/8 = 27/8
So (27/8)/(9/1)
(27)(1)/ (8)(9)
The answer is 27/72 or 3/8

7 0

4 years ago

Train a is traveling at 30 mph faster than train b. If train a travels 350 miles in the same amount of time that train b travels

GalinKa [24]

Answer:

20 mph

Step-by-step explanation:

Let speed of Train a = Va mph

Let speed of Train b = Vb mph

Va = Vb + 30

Let time taken for Train a = Ta

Let time taken for Train b = Tb

time taken = distance travelled/speed

Ta = 350/Va = 350/(Vb+30)

Tb = 140/Vb

But they both travel in the same amount of time.

So, Ta = Tb

$\frac{350}{v_{b} + 30}=\frac{140}{v_{b}}$

Cross multiply

$350v_{b} = 140(v_{b} + 30)\\\\350v_{b} = 140v_{b} + 4200\\\\350v_{b} -140v_{b} = 4200\\\\210v_{b} = 4200$

Divide both sides by 210

$\frac{210v_{b} }{210} \frac{4200}{210} \\\\v_{b} = 20 mph$

4 0

3 years ago