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2 years ago

12

Please help me asap.

2 answers:

kupik [55]2 years ago

5 0

Answer:

46.74ft²

Step-by-step explanation:

A= H(b) b/2 ≈ Sum of your area

Ray Of Light [21]2 years ago

4 0

Answer: 46.74 square ft (B.)

Step-by-step explanation:

Area of a triangle = (base × height) ÷ 2

A = (11.4 × 8.2) ÷ 2

A = 46.74

I hope this helps!

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Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 4.4 parts

Komok [63]

Solution:

To test the hypothesis is that the mean ozone level is different from 4.40 parts per million at 1% of significance level.

The null hypothesis and the alternative hypothesis is :

$H_0: \mu = 4.40$

$H_a: \mu \neq 4.40$

The z-test statistics is :

$z=\frac{\overline x - \mu}{\left( \sigma / \sqrt n \right)}$

$z=\frac{4.2 - 4.4}{\left(0.7 / \sqrt{23} \right)}$

$z =\frac{-0.2}{0.145}$

z = -1.37

The z critical value for the two tailed test at 99% confidence level is from the standard normal table, he z critical value for a two tailed at 99% confidence is 2.57

So the z critical value for a two tailed test at 99% confidence is ± 2.57

Conclusion :

The z values corresponding to the sample statistics falls in the critical region, so the null hypothesis is to be rejected at 1% level of significance. There is a sufficient evidence to indicate that the mean ozone level is different from 4.4 parts per million. The result is statistically significant.

4 0

3 years ago

Use the proportion below to determine 30% of 20.

mestny [16]

Answer:

x=6

Step-by-step explanation:

6 0

3 years ago

Solve the equation. 5(x + 4) = 70 18 14 –6 10

skelet666 [1.2K]

Assignment: $\bold{Solve \ Equation: \ 5\left(x+4\right)=70}$

<><><><><>

Answer: $\boxed{\bold{x=10}}$

<><><><><>

Explanation: $\downarrow\downarrow\downarrow$

<><><><><>

[ Step One ] Divide Both Sides By 5

$\bold{\frac{5\left(x+4\right)}{5}=\frac{70}{5}}$

[ Step Two ] Simplify

$\bold{x+4=14}$

[ Step Three ] Subtract 4 From Both Sides

$\bold{x+4-4=14-4}$

[ Step Four ] Simplify

$\bold{x=10}$

<><><><><><><>

$\bold{\rightarrow Mordancy \leftarrow}$

6 0

3 years ago

Fiona has a coupon for $3 off the price of her meal at a local fast food establishment. her favorite meal is on sale at a specia

Helen [10]

The Original price of the meal was $12.16.

Discount Percent is defined as the discount given on the product per hundred .

For Example . if there is 10% discount on a price of $100.

The final amount will be $90.

Final amount paid by Fiona = $8.25

percentage discount = 10%

Let the original amount be x.

According to the question ;

x - 10% of x = 8.25

$x-\frac{10}{100} *x=8.25\\ \\ \frac{100x-10x}{100} =8.25\\ \\ \frac{90x}{100} =8.25\\ \\ x=\frac{8.25*100}{90}\\ \\ x=\frac{825}{90} \\ \\ x=9.16$

Since Fiona also had a discount coupon of $3.

The original amount will be $9.16+$3=$12.16.

Therefore , The original price of the meal was $12.16.

Learn more about Discount Percent here brainly.com/question/14587503

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5 0

2 years ago

a theater is designed with 15 seats in the first row, 19 in the second, 23 in the third, and so on. if this seating pattern cont

marusya05 [52]

Answer:

<u>131 seats</u> are in the 30th row.

Step-by-step explanation:

The theater is designed with the first row there are 15 seats, in second row 19 seats and in the third row there are 23 seats.

Now, to find the number of seats in the 30th row.

So, we get the common difference( $d$ ) from the arithmetic sequence first:

$19-15=4.$

Thus, $d=4.$

So, the first tem $a(1)$ = 15.

The number of last row ( $n$ ) = 30.

Now, to get the number of seat in the 30th row we put formula:

$a(n) = a(1) + d(n-1)$

$a(30)=15+4(30-1)$

$a(30)=15+4\times 29$

$a(30)=15+116$

$a(30)=131$

Therefore, 131 seats are in the 30th row.

4 0

4 years ago