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butalik [34]
3 years ago
9

Types 120 words in 100second. How many seconds does it take to type 258

Mathematics
1 answer:
Anna35 [415]3 years ago
7 0
215 seconds
100/120=.833
.833×258= 215
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Which of the following numbers are rational?
ololo11 [35]

Answer:

402

Step-by-step explanation:

2(109) plus 2(92) equals 402

6 0
3 years ago
Mr.lucido purchases a new video game system that is on sale for 35% off the regular retail price. if the retail price is $429, w
sammy [17]

Answer:

Regular price: $429

35% discount: 278.85

5% tax: $13.94

Final cost: 292.79

Step-by-step explanation:

regular price=$429

0.35(429)=150.15

429-150.15=278.85

35% discount amount: $278.85

278.85(0.05)=13.94

278.85+13.94=292.79

6 0
3 years ago
Cathy earns $32 after babysitting for 5 hours. How much money does she earn per hour?
telo118 [61]
The answer would be $6.40
4 0
3 years ago
Read 2 more answers
An article describes an experiment to determine the effectiveness of mushroom compost in removing petroleum contaminants from so
alexgriva [62]

Solution :

Let p_1 and p_2  represents the proportions of the seeds which germinate among the seeds planted in the soil containing 3\% and 5\% mushroom compost by weight respectively.

To test the null hypothesis H_0: p_1=p_2 against the alternate hypothesis  H_1:p_1 \neq p_2 .

Let \hat p_1, \hat p_2 denotes the respective sample proportions and the n_1, n_2 represents the sample size respectively.

$\hat p_1 = \frac{74}{155} = 0.477419

n_1=155

$p_2=\frac{86}{155}=0.554839

n_2=155

The test statistic can be written as :

$z=\frac{(\hat p_1 - \hat p_2)}{\sqrt{\frac{\hat p_1 \times (1-\hat p_1)}{n_1}} + \frac{\hat p_2 \times (1-\hat p_2)}{n_2}}}

which under H_0  follows the standard normal distribution.

We reject H_0 at 0.05 level of significance, if the P-value or if |z_{obs}|>Z_{0.025}

Now, the value of the test statistics = -1.368928

The critical value = \pm 1.959964

P-value = $P(|z|> z_{obs})= 2 \times P(z< -1.367928)$

                                     $=2 \times 0.085667$

                                     = 0.171335

Since the p-value > 0.05 and $|z_{obs}| \ngtr z_{critical} = 1.959964$, so we fail to reject H_0 at 0.05 level of significance.

Hence we conclude that the two population proportion are not significantly different.

Conclusion :

There is not sufficient evidence to conclude that the \text{proportion} of the seeds that \text{germinate differs} with the percent of the \text{mushroom compost} in the soil.

8 0
3 years ago
Please help!<br> what is it
Dmitrij [34]

Answer:

105

Step-by-step explanation:

The interior angle for R is supplementary to the 155 degree angle

(they add to 180)

180-155=25

The sum of the interior angles of a triangle is always 180

180-50-25= 105

3 0
3 years ago
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