All categories

3 years ago

Need help pls........

Mathematics

1 answer:

fiasKO [112]3 years ago

6 0

Answer:

427.39

Step-by-step explanation:

First find out what is 7.25% of 398.50

398.50 * .0725 = 28.89

Add the 7.25% of 398.50 to 398.50

398.50 + 28.89 = 427.39

You might be interested in

A college football team plays 10 games during which the season. In how many ways can it

maksim [4K]

Answer:

Step-by-step explanation:

4 0

3 years ago

Write the equatoin for line that goes through point 12,15 with slope m=-2

sesenic [268]

The equation is
y=-2(12)+15

the y intercept is b, therefore y, 15, is b

y =MX+b is slope intercept form
y=-2(12)+15

7 0

3 years ago

construct a 90% confidence interval of the population proportion using the giver information x=74 n=150

FrozenT [24]

Answer:

The 90% confidence interval of the population proportion is (0.43, 0.56).

Step-by-step explanation:

The (1 - α)% confidence interval for population proportion p is:

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

The information provided is:

X = 74

n = 150

Confidence level = 90%

Compute the value of sample proportion as follows:

$\hat p=\frac{X}{n}=\frac{74}{150}=0.493$

Compute the critical value of z for 90% confidence level as follows:

$z_{\alpha/2}=z_{0.10/2}=z_{0.05}=1.645$

*Use a z-table.

Compute the 90% confidence interval of the population proportion as follows:

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

$=0.493\pm 1.645\times \sqrt{\frac{0.493(1-0.493)}{150}}\\\\=0.493\pm 0.0672\\\\=(0.4258,\ 0.5602)\\\\\approx (0.43,\ 0.56)$

Thus, the 90% confidence interval of the population proportion is (0.43, 0.56).

3 0

3 years ago

What is 7 divide 550

Fofino [41]

78.5714286..answer ..........

6 0

3 years ago

Read 2 more answers

Jimmy decides to mow lawns to earn money. The initial cost of his electric lawnmower is $350. Electricity and maintenance costs

hodyreva [135]

Answer:

a) C(x) = 4x + 350

b) 13x; $13

c) 39

Step-by-step explanation:

a) Initial cost of lawnmower = $350

Maintenance cost for 1 lawn = $4

Maintenance cost for x lawns = 4x

Total cost function, C(x) = 4x + 350

b) Revenue = Cost + Profit

= C(x) + P(x)

= 4x + 350 + 9x - 350

= 13x

Charge per lawn = $\frac{\text{Revenue}}{\text{Number of lawns}}$

= $\frac{13x}{13} = \$13$

c) For Jimmy to make a profit, P(x) must be greater than zero i.e.

$P(x) >0$

$9x-350 >0$

$9x >350$

The smallest integer value of x that satisfies this inequality is 39. Therefore, Jimmy needs to mow 39 lawns in order to start making profit.

6 0

4 years ago