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4 years ago

Will give brainliest to correct answer.

Mathematics

2 answers:

ELEN [110]4 years ago

8 0

The answer is the first one: f(x)= 25 / ( 70-x).
Because the current, x, will be subtracted from the speed given to give the final speed, and the25 miles is the distance. Time = Distance / Speed.

mario62 [17]4 years ago

3 0

To solve this problem, we can already start looking at which equation we can make, since we have all the data. To find the time it takes, we know that we will have to have the distance on the top and the speed on the bottom. That eliminates the bottom two options. But, since we know that the speedboat is moving against the current of the lake, that means we subtract x from the total speed, 70. That means that the answer to this problem is f(x) = $\frac{25}{70-x}$

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4 0

3 years ago

Read 2 more answers

David has 75 arcade tokens each arcade game at dave and busters costs 5 tokens which inequality matches this scenario

lys-0071 [83]

Answer:

≤

Step-by-step explanation:

Note that

> means greater than

< means less than

≥ means greater than or equal to

≤ less than or equal to

David has a total of 75 tokens and Dave and busters costs 5 tokens per game. David cannot spend more than a total of 75 tokens, thus a less than or equal to sign would be used

5g ≤ 75

where g = total games than can be played

7 0

3 years ago

An experienced landscaper can landscape garden with an area of 60sq.m thrice as fast as an apprentice. Working together, it take

Genrish500 [490]

Answer:

It will take the apprentice 24 days working alone

Step-by-step explanation:

Let the number of days it takes the apprentice be x

It will take the landscaper x/3 ( since he is three times faster)

The rate for both will be 60/6 = 10 sq m per day

Rate for apprentice is 60/x

rate for the boss is 60/x/3 = 180/x

Adding the rates together;

60/x + 180/x = 10

240/x = 10

240 = 10x

x = 240/10

x = 24 days

7 0

3 years ago

While Tina is shopping, she finds a pair of pants she wants to buy that is priced at $35 but is on sale for 60% off. What expres

zysi [14]

Answer:

35x.40=14

Step-by-step explanation:

you multply $35 by .40 because that is the remaining cost from 60%

8 0

3 years ago

Read 2 more answers

The estimate of the population proportion should be within plus or minus 0.02, with a 90% level of confidence. The best estimate

Rudiy27

Answer:

The sample size required is 910.

Step-by-step explanation:

The confidence interval for population proportion is:

$CI=\hat p\pm z_{ \alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n} }$

The margin of error is:

$MOE=z_{ \alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n} }$

Given:

$\hat p = 0.16\\MOE= 0.02\\Confidence\ level =0.90$

The critical value of <em>z</em> for 90% confidence level is:

$z_{\alpha /2}=z_{0.10/2}=z_{0.05}=1.645$ *Use a standard normal table.

Compute the sample size required as follows:

$MOE=z_{ \alpha /2}\sqrt{\frac{\hat p(1-\hat p)}{n} }\\0.02=1.645\times \sqrt{\frac{0.16(1-0.16)}{n} }\\n=\frac{(1.645)^{2}\times 0.16\times (1-0.16)}{(0.02)^{2}} \\=909.2244\\\approx910$

Thus, the sample size required is 910.

5 0

3 years ago