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Mathematics

2 answers:

Vitek1552 [10]3 years ago

3 0

Sorry for my bad handwriting a notebook lol

Sedaia [141]3 years ago

3 0

Answer:

9/25

Step-by-step explanation:

$\frac{3}{5x} - \frac{2}{3} = 1$

$\frac{3}{5x} = 1 + \frac{2}{3}$

by taking LCM,

$\frac{3}{5x} = \frac{3}{3} + \frac{2}{3}$

$\frac{3}{5x} = \frac{3+2}{3}$

$\frac{3}{5x} = \frac{5}{3}$

cross multiply

5x × 5 = 3 × 3

25x = 9

x = 9/25

hope this helps you!!

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Several years ago, 38% of parents who had children in grades K-12 were satisfied with the quality of education the students r

Colt1911 [192]

Answer:

$0.428 - 1.96\sqrt{\frac{0.428(1-0.428)}{1165}}=0.3995$

$0.428 + 1.96\sqrt{\frac{0.428(1-0.428)}{1165}}=0.4564$

We are confident that the true proportion of people satisfied with the quality of education the students receive is between (0.3995, 0.4564), since the lower value for this confidence level is higher than 0.38 we have enough evidence to conclude that the parents' attitudes toward the quality of education have changed.

Step-by-step explanation:

For this case we are interesting in the parameter of the true proportion of people satisfied with the quality of education the students receive

The confidence level is given 95%, the significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical values are: