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3 years ago

Pls help me find the area. See image below.

Mathematics

1 answer:

Nastasia [14]3 years ago

4 0

it is 47.25ft

because the formula is

= 0.5×a×b

=0.5×10.5×9

=47.25

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The slope intercept form of the equation of a line that passes through point (-2, -13) is y = 5x - 3. What is the point slope fo

Alona [7]

Answer:

B. y+13=5(x+2)

Step-by-step explanation:

I personally do y=_+_(x-_) when solving these equations

Plug in -2 the x coordinate for (x- (-2) to be (x+3)

Plug in -13 for the y intercept.

5 from 5x is the slope.

Thus y=-13+5(x+3)

Then just move 13 to the other side

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3 years ago

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3 years ago

A student researcher compares the heights of men and women from the student body of a certain college in order to estimate the d

maria [59]

Answer:

(0.6613, 8.3387)

Step-by-step explanation:

Let the heights of men be the first population and the heights of women be the second population. Then

We have $n_{1} = 15$ , $\bar{x}_{1} = 69.4$ , $s_{1} = 3.09$ and

$n_{2} = 7$ , $\bar{x}_{2} = 64.9$ , $s_{2} = 2.58$ . The pooled

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$s_{p}^{2} = \frac{(n_{1}-1)s_{1}^{2}+(n_{2}-1)s_{2}^{2}}{n_{1}+n_{2}-2} = \frac{(15-1)(3.09)^{2}+(7-1)(2.58)^{2}}{15+7-2} = 8.68$

The 99% confidence interval for the true mean difference between the mean height of the men and the mean height of the women is given by (if the samples are independent)

$(\bar{x}_{1}-\bar{x}_{2})\pm t_{0.01/2}s_{p}\sqrt{\frac{1}{15}+\frac{1}{7}}$ , i.e.,

$(69.4-64.9)\pm t_{0.005}2.946\sqrt{\frac{1}{15}+\frac{1}{7}}$

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3 years ago

About which point or line is the absolute value parent function symmetric?

Tpy6a [65]

A I think is correct, but you may want to get a second opinion.

7 0

3 years ago

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An element with mass 800 grams decays by 8.2% per day. How much of the element is remaining after 15 days,

Serjik [45]

Given:

The initial mass of an element is 800 grams.

Decay rate = 8.2% per day

Number of days = 15

To find:

The remaining element after 15 days.

Solution:

The exponential decay model is

$y=a(1-r)^t$

Where, a is the initial value r is the rate of interest and t is time period.

Putting $a=800,r=0.082,t=15$ in the above formula, we get

$y=800(1-0.082)^{15}$

$y=800(0.918)^{15}$

$y=221.68188$

$y\approx 221.7$

Therefore, the mass of the remaining element is 221.7 grams.

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3 years ago